Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd7cecaa0212192…

MALICIOUS

PDF

74.9 KB Created: 2021-02-23 10:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 88d416d4e21dcee1b1afc566013a50fe SHA-1: 4531371c4680333662027d448e551ac047b97a8c SHA-256: 5cd7cecaa02121929264a0eedab03847e5ebc4dc7203826ed8582d5fa7f76e46
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 point to other PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious content.

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://jottigo.ru/aws?utm_term=lg+bh5140s+manual+pdf PDF link annotation
    • https://lomixefewagad.weebly.com/uploads/1/3/4/5/134592496/6939260.pdfIn PDF document text
    • https://fezivalolir.weebly.com/uploads/1/3/4/4/134461714/7050201.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/jiktkgf/cardboard_design_lab_ios.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/c4694f.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/nesigu_wewunogakub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_6032a5bf82a1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386336/normal_5feb4b7a40389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_602e71d80fe26.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/5igibCy/reluro.pdfIn PDF document text
    • https://sajogosekatoja.weebly.com/uploads/1/3/4/6/134682383/febelut-bimofonuzera-tobimikigogexu-japoje.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/fusopoxipo/kovomilelibibozawogade.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/menorrhagia_guidelines_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/sovamatudedorusubo.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/possessive_adjectives_french_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/lisbon_time_out_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/86027301593.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/bts_funny_moments_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/94041222369.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/backup_password_gmail_android.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_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 5848 bytes
SHA-256: b34893804b3e7f7fc729ba8d6b9913b2d64febbbfb7cbcec10bde8a07f5f170f
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 11792 bytes
SHA-256: 1cd46d5c00a57a75a34e6bb21850a7e20bdb6dac1dd5946f19021b3b08bd1599

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