Malicious PDF — malware analysis report

Static analysis result for SHA-256 a105be33ba89bb64…

MALICIOUS

PDF

73.4 KB Created: 2021-06-13 03:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 668ad6a71b6808cfe03b698137b06743 SHA-1: 17a4b0b9edcb320ef5f4acf54c1b9f21e8a891c5 SHA-256: a105be33ba89bb647b311a24b459c64fe8270d5bfceaab7718a52ad595a7f1cd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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.
  • 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://huntic.ru/pbw?utm_term=the+fire+within+james+baldwin PDF link annotation
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/pabutobi.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/4e992.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/boredop.pdfIn PDF document text
    • https://rifitozimolumi.weebly.com/uploads/1/3/4/6/134667823/4471183.pdfIn PDF document text
    • https://xidolunojedi.weebly.com/uploads/1/3/1/0/131069950/e306392439247.pdfIn PDF document text
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/xoxodadek-medefakutemumag-rukubo-sivet.pdfIn PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/7067648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490369/normal_60027cb80fc6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_604138580de41.pdfIn PDF document text
    • https://rabitobepuxujit.weebly.com/uploads/1/3/4/0/134012490/0d5ec32a498.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/1620000.pdfIn PDF document text
    • https://delaludesepomaz.weebly.com/uploads/1/3/4/0/134096679/kegetise-pidofamasiban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_6056dedb8f7e1.pdfIn PDF document text
    • https://balolekuzuwuvaz.weebly.com/uploads/1/3/0/7/130740598/tebubuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_6016046a38e34.pdfIn PDF document text
    • https://pudomawiwo.weebly.com/uploads/1/3/5/9/135958378/7616011.pdfIn PDF document text
    • https://modurofeg.weebly.com/uploads/1/3/4/3/134376635/f2e59df53c12c6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386086/normal_6003c3c21200e.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/girub.pdfIn 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/4ae89f39-0d98-49b4-b6ab-a8a234fea056/wivemufuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56e7bbf-eaf6-4d0c-ab12-92f3de1350d1/rumukenazodofegidibaleb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca4a9b6-aae8-49f0-af28-e5ecf6e63913/emily_dickinson_poems_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46aa120f-e07e-49cb-8be9-a7ee8eabe856/whirlpool_refrigerator_manual_wrx735sdhz02.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15c23e3-6994-4c05-9839-63c01e7e169f/troubleshooting_a_kenmore_800_series_dryer.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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 5404 bytes
SHA-256: 3e1d13b8a0f105f09246f9e78210a310084e7553228e31ff32a127ed7b577476
font_01_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 10892 bytes
SHA-256: 9cc58869ed06c569077e3d9b38db33703c2bf9f2a88ff8e5583d0f99c364f0d2