Malicious PDF — malware analysis report

Static analysis result for SHA-256 d855fa72694e1287…

MALICIOUS

PDF

70.6 KB Created: 2021-03-16 12:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ecff4c134d17ff7c8015238c9c4cc0b SHA-1: b9484c175ed4c3c5f40b420549e2ad67f291e4c5 SHA-256: d855fa72694e12876f9ab2a4ed0f45e639f3b19aa1d36f9e4def428157f9c683
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as benign documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=abstract+nouns+worksheet+for+grade+3+pdf
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/mafos.pdf
    • https://cdn-cms.f-static.net/uploads/4384655/normal_601cb40526e3c.pdf
    • https://static.s123-cdn-static.com/uploads/4492536/normal_5fcaf3d58059d.pdf
    • https://cdn.sqhk.co/lemisobe/haS2jiZ/90318081890.pdf
    • https://cdn.sqhk.co/fasotaluvose/gjahgPC/star_wars_hyperspace_sound_effect.pdf
    • https://cdn.sqhk.co/tinipuded/idkIZhi/82173153183.pdf
    • https://parexuboruz.weebly.com/uploads/1/3/6/0/136089541/pisudawusa.pdf
    • https://cdn.sqhk.co/bafebolabefo/v3hcge6/34603192699.pdf
    • https://cdn-cms.f-static.net/uploads/4378386/normal_60261abbd68f2.pdf
    • https://static.s123-cdn-static.com/uploads/4531523/normal_60052e8413236.pdf
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/6598897.pdf
    • https://cdn.sqhk.co/fizuborugas/jhaheia/i_m_not_a_helicopter_mom_meme.pdf
    • https://cdn.sqhk.co/pigalixow/i5lghgj/99159130144.pdf
    • https://cdn-cms.f-static.net/uploads/4384820/normal_604492b3a5657.pdf
    • https://cdn.sqhk.co/mugapowejog/3iegdoa/70781272115.pdf
    • https://rewojomivatal.weebly.com/uploads/1/3/5/3/135345623/2110954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_3811c8a776054f2e87a77b87e67c8093.pdf?index=true
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_e109a4a607d94fc4bd46122b2d779619.pdf?index=true
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_7faa8551ed704e8088b4ac14154987f8.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_ea43d332afb84655a4defbf23286dda0.pdf?index=true
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_e6a4f2c21626493085e0e397b7d531c7.pdf?index=true
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_46bda6d0f15646bda3aedbfa38b51395.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_a5cda6d7013047baa3f2741d317ee1de.pdf?index=true
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_5c20e1bbf44a4c448b515581d219f94d.pdf?index=true
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_f79f742d8dfa4f25b6d772988b330adf.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c6.bin
1145e633ab699a3bc16ba0e5456adfbe8a0510219c1ddeaae41e5e3b9263dbdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 5832 bytes
font_01_sfnt_off0000e9ae.bin
c64d5c731b1f99c08d9263be83e8cffaaf1d229242e06f634b495de6bf9525a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 10256 bytes

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