Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a81c3908801922…

MALICIOUS

PDF

91.5 KB Created: 2021-03-29 17:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 26c16d555b3d3ac5f0ddab96633c3dea SHA-1: e76cb7f64388fa71c620a29fa26491d4ced209a5 SHA-256: 12a81c3908801922464d4c1e09f35ab297a5a9154755ca4130ce369b8bc6f60f
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 are SEO-themed and point to benign S3 buckets, but one critical link points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points to 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://mezovuduw.ru/strik?utm_term=lexus+es300+hybrid+2019 PDF link annotation
    • http://hh666o.site/25837439300mfaz8.pdfIn PDF document text
    • http://save50it.pro/25661254251fg7fs.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/polojuliragam/red_white_christmas_lights_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/kazalokoxexib.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/9480689027.pdfIn PDF document text
    • http://vomogowejupilu.rf.gd/799741255.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/piripowowotojef.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/duvijavuluretuk.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/buffon_s_needle_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37b9d48-05f2-4ad1-8163-5e8027120208/organic_chemistry_7th_edition_brown_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb487c3c-5de2-4312-a204-897cf853f7e6/12860146979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d86413-1493-4897-af5b-1f8d6690f502/79509032956.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_5b35daea87064d608c73b64974a9c6e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/43751435867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3cadc3-fa02-440a-85a4-26f59dd10ac9/korean_made_easy_for_beginners_audio.pdfIn PDF document text
    • http://gibuvelulano.rf.gd/lanizobapurebaseganipe.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/2430039587.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_a4a3b1e43b9847b79cb88e90362675f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/41551555470.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_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 5568 bytes
SHA-256: 5f168ebd893c40396e85265f0f70dde6114203ca54551a58b8ea91f61b0c3df7
font_01_sfnt_off00012cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 16356 bytes
SHA-256: 77c223d99bdd26101244ca848f90c6ac1e99dccdf4d0ea82de05ceed9839b024

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