Malicious PDF — malware analysis report

Static analysis result for SHA-256 9260b39fd92320a3…

MALICIOUS

PDF

100.0 KB Created: 2021-07-17 22:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 408363c29b052debe2b19d9a7cb5dd28 SHA-1: 0ae9032da464a7bdb4251ad5ca2bd426665e9eb9 SHA-256: 9260b39fd92320a3108dbb1150162256b0c84ad8afb8f0443abb4d038b0255be
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified an external URI and an SEO redirector link, suggesting a phishing lure for free downloads. Although no scripts were extracted, the PDF structure and heuristic firings strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8465

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/HbdJGeoIq_s/square?utm_term=12+angry+men+on+tv PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f169879014c44c5292d25f/1626433927843/rick_and_morty_ricksy_business.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1f35643f7b9065f70cbdc/1626469206831/types_of_chemical_bonds_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8251a3e9df788e6d4785/1626112594302/kaxabovazi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7ebe8300fd66e195ca64/1626111678074/an_alloy_of_zinc_and_copper_is_called.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee1c656d75c50a5d414d4e/1626217573689/business_administration_exam_questions_and_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7da95c244202458ae03b/1626111402041/on_the_top_side.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7ae69dbb92d34f5ac58de/1625796201379/the_great_hunt_wendy_higgins.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 10400 bytes
SHA-256: 47480adfb892d43e405b1a664d0cdfe2467daa0f3fa69a8a06ef3ecf7c79d422
font_02_sfnt_off000154af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154AF 17460 bytes
SHA-256: 07c7db27770454a47068cfd6e3ed5f536edf510048f1bf9b9809d0bf29b927bd

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