Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1447371ba07555b…

MALICIOUS

PDF

84.4 KB Created: 2021-07-22 03:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aff6f4ad55f927b492b443a026ff97cf SHA-1: ef3fbae8749363025e3a888bce6fad786d93bd22 SHA-256: a1447371ba07555b4417946be333f878bd9807dd2c8492717b902068dafe0f82
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically points to a free-download phishing lure using an external URI. Although the document body is heavily obfuscated, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attack designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://feedproxy.google.com/~r/sq/ugae/~3/kVSxLQpkboc/square?utm_term=i+hate+you+meaning+in+bengali PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e948a766be7e490f10e413/1625901224056/the_fast_and_the_furious_hobbs__shaw.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec9121f6fc466b5bf44d00/1626116385280/fisedekaxu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f2d1738c10a93e5046e5eb/1626526067473/day_since_27_april_2007.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f59d10578b8e70bd3de1f1/1626709264168/83576753722.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0127ae00eb31d7cee4e15/1626346106516/presidential_debate_questions_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f3d12dce637c25833f7917/1626591533246/terraria_connecting_to.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f2fc1d7e0b4d5f6b16825c/1626536989428/pidakepuguxik.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f8a2188c7b33121df666e4/1626907160686/bofosapebinowug.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f103795142327a87400d05/1626407801691/3425657393.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f330acd9389f5e808c3dce/1626550444724/tegesopovup.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8f607563c1506a8b439ab/1625880071459/kovozenewaviroviv.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f21b7cc375756552b1a916/1626479484741/what_comes_first_clear_to_close_or_closing_disclosure.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee7acbdb6052518ec9ed2b/1626241739811/vazabaxid.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f1541f3d214e0c07833eac/1626428447750/ravoroketuf.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f518fbac778402357fcec9/1626675451984/kaloserikitubatemupuwer.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f612b378325d0aebb9fd84/1626739379400/76062762901.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f6d57d9ce1d27a1e032527/1626789245221/types_of_integrated_circuit.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_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 10592 bytes
SHA-256: 94dce8eb3e76246b07b95d8b225e582ded8ee0a6330ef0dff7b3f318b64127ce
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 17796 bytes
SHA-256: f1d60cd94c166574333a8957d006c145eca1b6f39d88bf919efc71f4788811b3
font_02_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1