Malicious PDF — malware analysis report

Static analysis result for SHA-256 6935a53f3ff5fabb…

MALICIOUS

PDF

60.1 KB Created: 2020-11-21 23:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d6327e0a43ad154fd4e8d584414e231c SHA-1: d4f65219519597f6521af09d1f0b7e4c5db26476 SHA-256: 6935a53f3ff5fabb25fd3bfe85007cc2b05eb2078f0706249060e83d01d8a4e0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to repair manuals. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=maytag+neptune+stacked+washer+dryer+repair+manual PDF link annotation
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/kinuwejalenogomunuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493541/normal_5fb48bb05da65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5faebd0311306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5faa01f16c339.pdfIn PDF document text
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/jabekudevawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_5fa183384cee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f900c77a60d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_5fabb4a32693b.pdfIn PDF document text
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/6214691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5f9734a3cade4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5f9b91cc42f1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f87f47025076.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/1396268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8be279e5db3.pdfIn PDF document text
    • http://www.consumerenergycenter.org/home/apIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/185b2ffa-8412-4705-8874-177dbd67afc9/kukunojagopipog.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_off0000b0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EC 5748 bytes
SHA-256: e7cda189fbe00090586de4d7b713be7298b1b361f9edca4ba81b6f92581c1933
font_01_sfnt_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 9020 bytes
SHA-256: 9cbca10798628ced96cbc7a3ef8f8126dcc43f59b8956f72f6a1350b17b38401

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