Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2b2b56d955967e…

MALICIOUS

PDF

69.7 KB Created: 2021-05-11 23:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f9983dfaec9f9d61921db26d4b0a1f6d SHA-1: 474ebc03772c59b98a736613514a17355a5b2b06 SHA-256: 3c2b2b56d955967e7d6b60edd09f0803506d61d3fa5d8f421dfac5fe4b400235
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The presence of a large number of external PDF links, many pointing to S3 buckets, suggests a link farm or SEO poisoning attempt to distribute malicious content. While no scripts were extracted, the PDF structure and link analysis strongly indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=stihl+hs45+parts+manual In PDF document text
    • http://zereteleriw.getenjoyment.net/13469435529.pdfIn PDF document text
    • http://kushtanash.ru/safe_haven_humane_societymxm2s.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/macbeth_graphic_novel_quick_text.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fcca75f0f17c.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/forrester_robotic_process_automation.pdfIn PDF document text
    • http://asta-stroy.ru/36133243463cbo8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5fc67d64a5a7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_604f47eb3f9b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/boxalewijim/claimant_guide_warband.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/25926492801.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/cbre_vietnam_annual_report.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_24b62a2a60a545a29f87660075bd1a5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/itunes_app_store_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/karofeme.pdfIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_37a1ac5aa1504bafb2b2e32989d3196f.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_8590fdb12478481aa7c745fcd9ef70d4.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_a8c8d7ac299d493caec7e804f4d75a93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/81759136846.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/cognitive_behavioural_therapy_schizophrenia_review.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 5028 bytes
SHA-256: e0c3f5743d3f9e532d9625f18ba5d76b35055d0cb9ce24eb503cd2b7e61a3c54
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 10164 bytes
SHA-256: e0171ed90859ad826fbc567a711b0e27c28db4f20b9f1f77eed4aa149cd5376e
font_02_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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