Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9733bf2cd539f38…

MALICIOUS

PDF

96.1 KB Created: 2021-07-23 04:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aa69b589ed1a943ecbce4a8643f380c6 SHA-1: 7bafe43fed49cb7a8b6b356f3f53e82ee0df9a0b SHA-256: f9733bf2cd539f382ad9330dc719d68df1df06d126427083312982826f2a2c3a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a redirector link, specifically an image lure pointing to a URL associated with phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to lure the user to a malicious site, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/square?utm_term=are+black+eyed+peas+beans+or+peas PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee86a11f51426150d0faa2/1626244769343/minecraft_how_to_give_yourself_xp.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1788093f2b30038116984/1626437760614/introduction_in_oral_communication.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f47bb41d350707422aded5/1626635189121/57642707224.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee4d2a2485902f3e7487ff/1626230059010/how_to_end_a_persuasive_letter.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f64fa8132d7d1ce062ee76/1626754984225/68377259975.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed8ae2f77a3e4a90f5db43/1626180323392/philips_dtr220_05_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e802cfefb14d112212eebf/1625817807422/sovoxufufimajafuvuzaloga.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0105bfdf15601434b3cd2/1626345563706/siramunozorugiwi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ede28510369373fd846868/1626202757285/the_intercostal_nerves_innervate_the.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f9ed1408bf7f1ae12b488c/1626991892552/lines_and_angles_class_5_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f6c9910503dd1253797d14/1626786193323/50095256319.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efca62c00d13116b422223/1626327650232/25_minute_hiit_workout.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f9ebc1cb445e62773e4591/1626991554058/explain_electronegativity_with_example.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f183e4f75f957e35bb0e7c/1626440677081/nurujib.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f071dbac785a4b5bad0cc2/1626370523957/94130435126.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f49bbf81f38b205894f1fa/1626643391948/cipher_with_letters_numbers_and_symbols.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_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 10644 bytes
SHA-256: 28ab19a4e7af375bbdc7d3d65e6e62ecd193ad24ea91f66c3a3fe4d7b97f85f0
font_01_sfnt_off00012dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E9 17088 bytes
SHA-256: 4b63fe008338fd353f64fb302d4af72b0f35a434347ced2a4bca1fcae92dbb95