Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a0a7da416e33ab…

MALICIOUS

PDF

64.3 KB Created: 2020-11-26 03:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0e62c4cf77e06d20f9fabb616230be67 SHA-1: ed673c58143e70c735e949ef522345aa2faf6421 SHA-256: b2a0a7da416e33ab77a736307820d003202038b5a17130b14bbc2cf6216e9b88
156 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. It contains a mass external PDF link farm, with one primary malicious URL identified as 'https://traffnew.ru/strik?utm_term=pt6a-60a+engine+for+sale'. The document body, though heavily obfuscated, suggests a lure related to a sale. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffnew.ru/strik?utm_term=pt6a-60a+engine+for+sale PDF link annotation
    • https://dotigima.weebly.com/uploads/1/3/4/4/134404546/fevuvuj-tovini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f9003149c528.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/235cb6b8ae.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/bejexe/chloromethyl_ether_conformation.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/adding_fraction_worksheets_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/279aefda-f6df-4af1-936f-7d9e3c873a79/dogitazipivumuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531c8159-66aa-4b72-93cb-9a5d1da2fd63/xogusimanirijesapara.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/shaman_classic_wow_pvp_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/wazuneni.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/61397821677.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/anencefalia_diagnostico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc32c09-b128-4496-a5c0-0578b81c4d6c/pupuxovanobeligibodu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/zibikofimisukobojazukef.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_off0000c015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC015 5264 bytes
SHA-256: 6ed16d28a2a8c25a031f1b8bdcb2deb6909f61b57e9ec30dc9c442af0078eff3
font_01_sfnt_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 10108 bytes
SHA-256: 24d8a7168640767b72185740776dffa715ca96a5d8f2d23e31983dc43c101d97

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