Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd53885cffff5f3a…

MALICIOUS

PDF

73.6 KB Created: 2021-02-26 18:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ef529bccfcaeb3796701eb0995f92e7f SHA-1: bacdc816480dd409f29444bb5fd0c35497ca927e SHA-256: dd53885cffff5f3a77096834af244242ffc96575a0efb2f26613cd25b444dea7
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security filters. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or scam pretext, possibly related to fake technical support or billing issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=arris+dg860p2+firmware+update PDF link annotation
    • https://fuvedomuwipiw.weebly.com/uploads/1/3/1/6/131636935/94345608d76bd.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/xevatil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb61d382743.pdfIn PDF document text
    • https://gazulaloruvuv.weebly.com/uploads/1/3/4/6/134693071/b230e837aa337.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/53677112438.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/96364089224.pdfIn PDF document text
    • https://finirawex.weebly.com/uploads/1/3/2/7/132741073/tajesusazapabi-kegepoxabelog-ronugolafofu.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/wayne_dyer_meditation_music.pdfIn PDF document text
    • https://sawanizoso.weebly.com/uploads/1/3/4/6/134654845/nawixawafiboj_tukama_bipoxovanaxilaw_lonodesujalimox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijazujarakowom.epizy.com/33915718432.pdfIn PDF document text
    • http://zevusup.atwebpages.com/how_to_calculate_compound_interest_over_time_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/6720203913.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/barclays_online_statement_password.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/19879250442.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_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 6032 bytes
SHA-256: c69f48ce1bf296a2a285e8d2bab6c47f186b8c6ea02c67670bc74773fcb8899b
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10792 bytes
SHA-256: 988b5a713b0a090a2ff4faa184791716d9c664faa3c5935e3da34436aeb2757f

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