Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae43d8f8e290a617…

MALICIOUS

PDF

86.9 KB Created: 2021-03-19 17:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 937bda2ffa1fc74fd04034760e45b730 SHA-1: 7ccd7be9b05c2e2108527eef8cd7fa6ee12cadfa SHA-256: ae43d8f8e290a617dfc0ee2fb8f27f51c568dbf1ed905f13433046f055bd0541
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were extracted, the presence of embedded URLs and the link farm heuristic suggest the document's purpose is to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=krona+dc+poderes
    • http://nominasacra.ru/92195476011iclcf.pdf
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fef980945336.pdf
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5fdbdecd23a1e.pdf
    • https://matowesefuwuw.weebly.com/uploads/1/3/4/5/134592497/1149539.pdf
    • https://jopokoguse.weebly.com/uploads/1/3/0/8/130874396/xopos-mujuvunewigeris-norokabufowosik-pulewozek.pdf
    • https://cdn-cms.f-static.net/uploads/4385853/normal_6035cf25c0c65.pdf
    • http://fsfsfd.xyz/89696528810wfz30.pdf
    • https://cdn.sqhk.co/jurunuxetal/HidIiHW/let_s_create_pottery_lite.pdf
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5fd7c408f4219.pdf
    • https://vusujotogeza.weebly.com/uploads/1/3/4/6/134653296/lilomizirol.pdf
    • https://cdn-cms.f-static.net/uploads/4413968/normal_603f918ea9e61.pdf
    • https://cdn.sqhk.co/dafibuxoki/gnjiW8j/niragadatobifojamufil.pdf
    • https://cdn.sqhk.co/gawukale/ZClpdhf/33491013277.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bizepusozuj.epizy.com/expanded_polystyrene_sheets_25mm.pdf
    • http://rotaduwifomol.rf.gd/25425131416.pdf
    • 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_off00011430.bin
beb3b971737de0d088622350a3858fb7987e5b3ef2c3be5abb47706d7219b7ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 5004 bytes
font_01_sfnt_off00012546.bin
b068f8c526f72a8e384cbe50d949559fd48f1f306114cd533a0c6ff1bbc0b193
pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 13132 bytes