Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b25a7083e70fa05…

MALICIOUS

PDF

61.9 KB Created: 2021-02-17 07:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 680d9daba41c8b2e588968cbf4309cee SHA-1: b4bf7131e4fe048910aa275a444c3c29db989728 SHA-256: 4b25a7083e70fa059194181c523ce772ee6457dc67788553e9ffcec43f0bf248
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a number. While no scripts were extracted, the presence of numerous external URLs, many on disposable hosting, suggests a link farm or redirection mechanism to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=proto+rail+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366024/normal_6013dfaa58685.pdfIn PDF document text
    • http://spain50off.info/nudos_mentales_bernardo_stamateas_gratish5epv.pdfIn PDF document text
    • http://yourbigdick.space/the_poisoner_s_handbook_worksheet_answer_keyaxszp.pdfIn PDF document text
    • http://mon-cmbretagne.best/sushant_singh_rajput_songs_mp3_free_download369h7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489716/normal_602b6783d9691.pdfIn PDF document text
    • http://itawegan.space/kawuwipolixemuzumede75l6o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_5fd3725428824.pdfIn PDF document text
    • http://weareanonymous.org/panesegonufivumukizefisvd8uq.pdfIn PDF document text
    • http://usmileofficial.site/41886380439byvll.pdfIn PDF document text
    • http://ergors.space/19487070447bdvwj.pdfIn PDF document text
    • http://nat-yoga.space/john_deere_gator_parts_manualgfu94.pdfIn PDF document text
    • http://wugigazugijub.22web.org/86571755662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_5fe87f7dded6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gunubepixel.epizy.com/difituleboxi.pdfIn PDF document text
    • http://konugatevokaxot.epizy.com/11091664616.pdfIn PDF document text
    • http://lelirovosas.epizy.com/67165208515.pdfIn PDF document text
    • http://fixedarutagovun.rf.gd/bokisolinogilutuja.pdfIn PDF document text
    • http://sizikipap.epizy.com/74582560917.pdfIn PDF document text
    • http://kiduxoz.epizy.com/wiketunadififusujoxofapo.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_off0000b6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AC 4812 bytes
SHA-256: 693b0ffbeeb85b4f166991222a5f439d05fb28b941a23e48af8a4cbcb710320f
font_01_sfnt_off0000c711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC711 10504 bytes
SHA-256: 857e205aaae42cae01feb8ed41c844a25e02edb8d23f3bd7124e26621c37d68d

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