Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8490aa036a84daa…

MALICIOUS

PDF

84.3 KB Created: 2021-04-10 16:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5b6f0e86a04f375756b768d7d6e13a0 SHA-1: 57ac6b1aca75676991562a928f345ab592982ea4 SHA-256: f8490aa036a84daa834a447ebea30e1db2f726f88ede85dd63a631be2df23829
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 0.9994

Heuristics 6

  • 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.
  • 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://golowaki.ru/strik?utm_term=juice+plus+transform+30 PDF link annotation
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/fajurixiruketi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486033/normal_5fd9201774b34.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/bifin.pdfIn PDF document text
    • https://mesupajediruz.weebly.com/uploads/1/3/6/0/136051454/62384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458838/normal_5fc98a2572edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_6052a51911165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_5fd5f53406a3c.pdfIn PDF document text
    • http://sosunimepewe.22web.org/bagiwegilovukutejed.pdfIn PDF document text
    • http://tesiwonogi.iblogger.org/59055529626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fd6292231193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_60281d286c702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_6031193a475dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5ffc8685dad97.pdfIn PDF document text
    • https://sukonusumetuf.weebly.com/uploads/1/3/5/2/135294143/01f237c8.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/linakonemanobuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5fef608299bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_6011206ee3c75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_fc00085f997b4ac79642b40c8e7fe487.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc7ae87-386b-49b3-b94c-271e533cd3a4/what_is_the_lean_six_sigma_certification.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_00ce7227f70a410b9e068985d61aedb8.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_6e0a91b5814140e7bf87389305589073.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_4b3ca405005e4cd686293e9b2d8f7766.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace30b4b-b755-4350-a9c9-5e81def2d9e9/fetiranevu.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_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 5456 bytes
SHA-256: a0f2b1693c2da34bfb9fd7bc0fe1566389a5d26b186f580c73f903b39c6a3efb
font_01_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 10744 bytes
SHA-256: 5db5b4023eabfff191f32dda521f25d11c9d372b35ac3c2d1b1885a6bae3f4be