Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6c931c617d99a0…

MALICIOUS

PDF

68.9 KB Created: 2021-03-17 10:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7421c59ffaa651f41972259df09e88f8 SHA-1: 13e86ce6b5b7a53ad002a40c9e056e50ef615a88 SHA-256: 0c6c931c617d99a06c6e56dae811fcb4dfa2c6124318f1e1e618d3acf350b5ac
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDF files. The primary URL, 'https://druttle.ru/wix?keyword=perkins+4108+parts+manual', suggests a lure to disguise the malicious intent. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or malware distribution document.

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://druttle.ru/wix?keyword=perkins+4108+parts+manual PDF link annotation
    • http://xojuxelase.medianewsonline.com/nusebezusaletoz.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/20259290588.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/lupuvogotog/nokawobuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4829aeec-2586-4755-b82d-0f297c78c2b1/honeywell_thermostat_th8320r1003_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d0d265-2434-4b93-814c-d9d700f27dbc/tupifegokodakaluwog.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_26d5bad1254f425596758edd5749ad14.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_9ceb54b94d57409a8b9e05518b7c5f24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/gusibowurotudizelijivibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374af99a-c829-479b-9072-8f15329d1276/sateva.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_af8d5181a3fa46bc892fdef80e993d18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ab50a3-f6c3-4263-97fb-5abf335f6d0a/warunesekolarinolemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4862e79a-8970-4ea3-9b73-adee1702d7d8/does_gravitational_force_change_with_height.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b2534a-2426-4eae-a3f1-c28a729b55b8/73509777164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774efb83-d29c-46cc-ad2a-f60727534ac3/39881098894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453b3893-4455-4e00-912e-e3adb69c66c6/63387827805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ef2cc9-900a-4c91-8614-144f5458d5eb/13189296780.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_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 5504 bytes
SHA-256: b84d394507ade54194b2b067005b708a81841b353e5a2fea7d8b9b23eafbdeae
font_01_sfnt_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 10644 bytes
SHA-256: a7ddf7edc5cad0c07c1f147ec20c6101245831fda1e4a56e86d53bcb60ee4499

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