Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c92ba949410fbf2…

MALICIOUS

PDF

78.3 KB Created: 2021-05-11 12:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f03f1240500e8da5b5b3670392d24c4 SHA-1: b17fa0fcc3b7c2fb37e0bbe01e0e4632e4117980 SHA-256: 8c92ba949410fbf2d41e59e92e49d79f415fcbbf52caf93a67f6d13fd171187a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm designed to boost search engine rankings or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery 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 0.9993

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://botokaw.ru/strik?utm_term=john+deere+z425+parts+manual+pdf
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/nagikat-mageku-fesorikipenijol-vumulanutavaroz.pdf
    • https://static.s123-cdn-static.com/uploads/4376600/normal_5fdea970c696e.pdf
    • https://cdn-cms.f-static.net/uploads/4474746/normal_6034ef727e4c3.pdf
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/vusezozow.pdf
    • https://cdn-cms.f-static.net/uploads/4448995/normal_606d58bbeb509.pdf
    • https://cdn-cms.f-static.net/uploads/4443821/normal_6028072f0f3a3.pdf
    • http://zipipenele.22web.org/kadikorurobadonetorarixo.pdf
    • https://cdn-cms.f-static.net/uploads/4376358/normal_605b523153a01.pdf
    • https://wimekigulaz.weebly.com/uploads/1/3/1/1/131163744/vituruluzi_bakevonirutej_zekuxi.pdf
    • https://cdn-cms.f-static.net/uploads/4490539/normal_6037591fcef59.pdf
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/53191.pdf
    • https://static.s123-cdn-static.com/uploads/4495707/normal_60091a2377bf0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jigosip.epizy.com/24491609165.pdf
    • http://sapakebozo.rf.gd/sentence_editing_worksheets_first_grade.pdf
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_33b72adab6d349c39306c18d9a786660.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_99e5c147ab0448b6a7c793d03716f2c3.pdf?index=true
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_475bb07df68b4f7baa4abd3251249174.pdf?index=true
    • http://nowaginog.epizy.com/61234414582.pdf
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_fbd459fc66664f82b4a8e5abc0c18df5.pdf?index=true
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_a42fa06a06e64b9d9aa6188a3ca683db.pdf?index=true
    • http://gurevetafajes.epizy.com/zotubafapirakevorake.pdf
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_b1b3dbdb6403455b8ccd7a606fe9a76d.pdf?index=true
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_12fb5b6da63a4d5da60d4f895c5e3cbd.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_off0000f25b.bin
7c5860723195b4e32f6860b0eb92b8a2e808f8baaafc7255b2a756a40b18bde0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 5664 bytes
font_01_sfnt_off0001057d.bin
ffa2dc71bffb0eb46798853ddcd68d65e4962758f7316fa5e220cb080cc83420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 11312 bytes

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