Malicious PDF — malware analysis report

Static analysis result for SHA-256 4550810ecdb1a0c4…

MALICIOUS

PDF

79.5 KB Created: 2021-05-23 00:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1190af9b36eb5dc7aeb1b0ff9a892b7b SHA-1: a6c60f5f587aa8a8af428399537c32244c92f14b SHA-256: 4550810ecdb1a0c40a69ae8be970b90dbb4568bc1d2b9994e26ec0f4bc933563
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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://druttle.ru/strik?utm_term=what+is+isoquant+curve+and+its+properties PDF link annotation
    • https://zegoliro.weebly.com/uploads/1/3/2/3/132303320/5022463.pdfIn PDF document text
    • https://nuwebobejope.weebly.com/uploads/1/3/1/4/131407692/52e04025c1e.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/93536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_6009b2e50db8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_60609d03081eb.pdfIn PDF document text
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/3925436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_606e1ff8d1ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_6026c5d7490fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_605d6ae34fa98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_60215e04b4c85.pdfIn PDF document text
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/5410445.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/2920629.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/zugaxorelolobigowugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_601af35d3a089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_602541df1a08b.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/9016351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_6016c1017b589.pdfIn PDF document text
    • https://jigudubexafodi.weebly.com/uploads/1/3/0/7/130738940/16ade9.pdfIn PDF document text
    • https://zetetolaz.weebly.com/uploads/1/3/7/5/137518759/felotaze.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/rejenokoxokot_jikekosogi_wuwebesudax_xejapif.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/limewub/25065759159.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/6016530256.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/bisoguxusirifazapij.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_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 5328 bytes
SHA-256: 8925de86d7d4e32e257e44b9dbd04cc0158a4d2e3edd811698bcfacd76641d0b
font_01_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 11552 bytes
SHA-256: 57453e28b36c94c0eea62ec5a9743fb0b422f1d4f39a055168f658eb8236a3e0

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