Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd33ca1410d6e88…

MALICIOUS

PDF

89.8 KB Created: 2021-04-05 07:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f01f2723d6ec67657bffc445fcce80c0 SHA-1: adf27329e7683173bbddbc1be08f44bf794ca7c3 SHA-256: efd33ca1410d6e881c443354fbc1ef6bf6f0cce40c86c1693a69d9d01f030e2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=fire+and+ice+boston+closed PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fdd1c904a433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_60528663003fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465000/normal_5ff6a03d30180.pdfIn PDF document text
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/xiligotipozaravi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_6029a28c7377a.pdfIn PDF document text
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/5384d2379cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456143/normal_5ffb60401a15f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466408/normal_6060075b955c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_771fdc522cf9400f94c2176aec447e53.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_c979a580cf5849b5b2f5123267c14d3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/ethiopian_music_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/ipmn_consensus_guidelines_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/enrique_iglesias_bailamos_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/48917510381.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_51ae7efba0e344e9b1ab80757d607bee.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_6eec80414e1a409ba2582b018d77231a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/92779176890.pdfIn PDF document text
    • http://xusavax.epizy.com/meningitis_classification.pdfIn PDF document text
    • http://dijovomivuz.rf.gd/62932151541.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_867557f805e44217ad1e11d26335716b.pdf?index=trueIn 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_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 5028 bytes
SHA-256: 7c4d6e94f8b78f192ca8ec82e2ab6c6fe96105a9edbc82265fd101ce0193340d
font_01_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 13000 bytes
SHA-256: 0b31f06c33dfa530974f3f0f66c1404af47965ee88969af6dd6fe47b060c27e0

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