Malicious PDF — malware analysis report

Static analysis result for SHA-256 831b090ecebfa735…

MALICIOUS

PDF

104.5 KB Created: 2021-07-22 00:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ec8eade1a284bd956b8add2d50365370 SHA-1: fa5fe17558076d4d278836f246685ad81f14bca3 SHA-256: 831b090ecebfa7354215f6b7d7a91513398af5145145da36d2403cfa9f6cca77
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic firing for a redirector link, specifically pointing to a URL that is likely part of a phishing campaign. The ML classifier also strongly indicates maliciousness. While no scripts were extracted, the presence of a redirector URL suggests an attempt to lead the user to a malicious site for credential theft or other malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/square?utm_term=another+word+for+jurisdiction PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0262249582827e2ff74c8/1626351138396/dnd_5e_level_up_experience.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f7bf5448de5a6273fa68b0/1626849108539/upsc_prelims_2019_question_paper_with_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f716de4038212b4dc6c428/1626805982874/my_throat_hurts_and_feels_swollen.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f66ba09c09b97e4fbd7f20/1626762144368/inverse_elasticity_pricing_rule.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f3269b04a1d97017995ea9/1626547867300/the_assistant_comic.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec79c731b0b43e07e5d009/1626110407368/99006276007.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e82fb47d3b385c94b8e303/1625829300142/ascii_code_to_text.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee63ce5f7927514e3fbc6d/1626235854563/39028647835.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f262a4699a8678c5714d7a/1626497700589/the_last_mughal_the_fall_of_a_dynasty.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e798d68592fe3a588dc48d/1625790678981/59681342022.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca433243eac6055d1d9d1/1626121267803/98005172627.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4560d50974615f92c0b39/1626625549882/xuxoworagukupewetuf.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f478f49c7c9f0ea9a6399e/1626634484805/story_of_wick_mp3_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee679c77e2cd4113f2917a/1626236828280/setawarikoku.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed9f7437bfc37e3c2361d1/1626185588943/pythagorean_theorem_in_circles.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f64e363fb69e7128f5b486/1626754615151/how_to_get_blood_out_of_wool_carpet.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f20e5a6d99b07844500066/1626476122289/jeditajuzepulepu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1dc082fa9935a47a45597/1626463240879/how_long_do_i_have_to_cash_a_check_before_it_expires.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7e25aafd06e4982eac739/1625809498885/63440805927.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f207e4c5becd4b2f0ca814/1626474468330/pafozapezewigadaba.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edbad0736bf92f3978b1ab/1626192593066/vonalomurelumida.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7ed1b8cbe518df574d12/1626111698094/how_to_clean_junk_files_in_windows.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f00173a26b2b69a35d56ae/1626341747575/dosajemosirodiso.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A0 17568 bytes
SHA-256: 76cbc167720b8552466bf5c3507a9f7d4ec940a8c659523dfaa37a94c47d684b
font_01_sfnt_off000163a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB8 10660 bytes
SHA-256: 1f4cee0459ea555d4cb9b06d30b64a78ffeb8370e21d22a2deb86e306a7ef44b

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