Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2b07b39f8fdecb…

MALICIOUS

PDF

74.0 KB Created: 2021-02-07 10:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6d97fa549542d9274b85f60e69ed19d1 SHA-1: 197ebbde6ea05d29dab7bb41ba350cde8a42fbb7 SHA-256: bc2b07b39f8fdecbe37fa427dbd03be20b80e912c20b3f53e60a710624ee5704
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document functions as a link farm, directing users to numerous external PDF files hosted on disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides a password to decrypt a subsequent archive, a common tactic to evade initial security scans. The 'SE_CALLBACK_LURE' heuristic suggests a pretext for user interaction, possibly related to billing or technical support scams. While no scripts were directly extracted, the ML classifier strongly flags this PDF as malicious, and the numerous external links suggest a downloader or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/123?utm_term=edgenuity+student+2020 PDF link annotation
    • https://bevamiwe.weebly.com/uploads/1/3/0/7/130739198/rudixenudo.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/MVijKjj/vufiparuxanuxonuxun.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/fij4hiG/warriors_super_team_song.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/fiNpKig/60597390542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_6000cca58d70d.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/b76de749.pdfIn PDF document text
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/9598605.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/tomitagure.pdfIn PDF document text
    • https://sudazevoj.weebly.com/uploads/1/3/1/4/131406082/wejesof.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/qhjgdFD/usa_network_tv_guide.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/1218585.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/wowenelijoj_wonevinofazife.pdfIn PDF document text
    • http://dmdmassage.com/fastest_video_trimmer_androidwnxhd.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/biciegg/74449638407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/single_bed_fitted_sheet_cotton.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_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 4988 bytes
SHA-256: 1b1de0d19dc02175b278a9eb8c19b819162a65f5de3b350895fb20cb53668582
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 11008 bytes
SHA-256: 8fa9717b669191bd3e8b3fd987439fc4a79f55d2bf78d00014589c049edf8f20

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