Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a654881078d6fa…

MALICIOUS

PDF

78.8 KB Created: 2021-02-18 23:29:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 093a08d705b534fc9b2251cd8e7402d7 SHA-1: 7852d30ee1a4ed29d16611e6903982a23f4558e2 SHA-256: 84a654881078d6fa7ddfbeb81e6c64a50e60ad3cacb2bddd98268ae4053ec044
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/wix?keyword=frontier.com+webmail+login+page PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5fcd7dfa9e464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383321/normal_5ff3ebdca264d.pdfIn PDF document text
    • http://xemopubuga.iblogger.org/mifet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5fe78388e5bc8.pdfIn PDF document text
    • http://carins.info/gorirelatajz0183.pdfIn PDF document text
    • https://zimuroxojirewun.weebly.com/uploads/1/3/1/4/131407818/3837945.pdfIn PDF document text
    • http://rfs.team/77053375479g1n9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_5fda465c862e4.pdfIn PDF document text
    • http://markettop.pro/68657607076jg873.pdfIn PDF document text
    • http://lovemecompletely.com/536244847648v3xn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vusegax.rf.gd/xibarozevupi.pdfIn PDF document text
    • http://wozojatoxako.epizy.com/gift_voucher_template_free_uk.pdfIn PDF document text
    • http://lugirike.epizy.com/17747177197.pdfIn PDF document text
    • http://sumawimibodi.rf.gd/89354390976.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/59834833598.pdfIn PDF document text
    • http://buvodomugefun.rf.gd/nccn_guidelines_breast_cancer_surveillance.pdfIn PDF document text
    • http://rugeritubaduw.epizy.com/amharic_traditional_music.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 5296 bytes
SHA-256: ed88e5e74347a962fac8c0347e0531c3a98b9dfdf3f4a8c3828552e0b387d411
font_01_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 10268 bytes
SHA-256: 19cdfa5c3e910d22bf84a9801634e7803c728b1a66cde1bcd6edf5e96a365e3d

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