Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b7669ad8585b98…

MALICIOUS

PDF

77.7 KB Created: 2021-07-12 23:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6b6a4a58490c8b9d1e6b16424b3c6af6 SHA-1: f3f022f420bdb816dc89a8cd9d5a43bd000826a0 SHA-256: d1b7669ad8585b9867167bfe613c1a10e94ae58f2e8e37b521979625fe3213a0
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the presence of an external URI and an SEO redirector link, suggesting a phishing lure for free downloads. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/eoPDrVzwpx0/square?utm_term=section+1+continental+drift+answer+key PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e862426a722549e4220339/1625842242257/read_a_person_like_a_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e93b8d1448b06198494747/1625897869789/dead_target_apk_mod_unlimited_gold_and_money.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e81188fdc75e32ab09baaf/1625821577087/homologation_in_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9fdd9cb57f380a7a4060/1626120157862/27047585202.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e88a5ec983e84b39b41d8c/1625852510937/merobize.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e872adce08835aaf18aa82/1625846445995/wefadajodaxomubapik.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e85e71b34e3e37de33a1d8/1625841265656/annals_of_endocrinology_and_metabolism_impact_factor.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b73ddbc52028c83dafe7/1625798462007/22752069802.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8756740fe410b3be914b1/1625847143304/kegukuwokakiwewa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7d58cc97682122421236/1626111320825/mood_off_meaning_in_telugu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eca591704a383bbedcd94e/1626121617484/nimagekikofosesuxoxeviwa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e92f8b37cb9044756076e7/1625894795965/bowame.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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 15868 bytes
SHA-256: 69c6e20e629d130ea3a3c3b783987d166c80b50e1b1662b35e606794a2902d02
font_01_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 10888 bytes
SHA-256: f11ba9a84cfaab3b637b6efc19602cd1de16b193f1596604f18f3c52a6c83cf1

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