Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac92e954be593e03…

MALICIOUS

PDF

70.5 KB Created: 2020-12-31 05:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2a479469d377c27a421b84a40767a597 SHA-1: 7c176281e46e012b05286fd3dc0c4fb216af80e2 SHA-256: ac92e954be593e03ce8af984e33caed3014ebdc172edef0c2affdbbab97b1952
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains numerous external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=minecraft+pixel+art+templates+pokemon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5fb2a3996d7d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497082/normal_5fd96613dc363.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/023816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5fe1ba9e808cc.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/juvosi/suzaworiwanigofisor.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/over_my_shoulder_song.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/multistage_amplifier_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/94478802334.pdfIn PDF document text
    • https://s3.amazonaws.com/padoragog/zadavikizad.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/vakolosiwigugutoleligavav.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/zufabugubogojologapiliwe.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/85093879797.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_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 5300 bytes
SHA-256: 3b7aa7f79c6f0dfa143f3e3c8fca130602d1d66033d9c7e480e17c359700ce5f
font_01_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 11244 bytes
SHA-256: 5faef097df784b85a175c0ff544742f7ec7369f17665a21a10518eacd6650675

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