Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20dbdf84c2e36cf…

MALICIOUS

PDF

74.4 KB Created: 2021-03-01 23:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed61679f6e638a305e471f7cfb45cae1 SHA-1: b17de0ecd3347d5eabb80c6f80e8420c7662bdd1 SHA-256: c20dbdf84c2e36cf9df18e294db132956f0a634d7aed752576bc9abde038d41f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily corrupted, contains keywords related to 'alternative android market apk', indicating a lure to download potentially unwanted or malicious applications.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/wix?keyword=alternative+android+market+apk+2020
    • http://remont-pc.website/16457331377qq95i.pdf
    • http://kdghy.online/census_report_2011_assamk8fok.pdf
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/xiwegadifiwoma.pdf
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/2607375.pdf
    • https://nawixelufa.weebly.com/uploads/1/3/5/3/135317770/c7e60b7ba78b310.pdf
    • https://bilidugudixuxo.weebly.com/uploads/1/3/4/9/134902455/suwivinim.pdf
    • http://worabipupe.mypressonline.com/what_would_you_do_in_the_first_30_60_and_90_days_as_a_supervisor_why.pdf
    • http://organize.shop/javusosud3jhk.pdf
    • http://playmarket-online.com/wajoxobogaweligojupedudawd5tm3.pdf
    • http://webdefilmizle.com/desarrollo_de_software97u4w.pdf
    • http://libralab.digital/bexadikaparenefwtl8n.pdf
    • http://siwivelijutore.medianewsonline.com/94113747892.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rizezobabub/rovetopizinekujuvorometi.pdf
    • https://s3.amazonaws.com/gopuze/62147425975.pdf
    • https://s3.amazonaws.com/lebaxa/52461754176.pdf
    • http://zizenatoxu.myartsonline.com/quotes_in_the_veldt.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_off0000e69b.bin
6965e264c4471a0d6fd39811b1cc5ef9e7ffd4bd63bd4d68acc0fa6b4b3e0181
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 5316 bytes
font_01_sfnt_off0000f8a0.bin
ca92059c2dd841b64b5cdba0ab6f280bc156c24401701fbca5fc2352f0cc7181
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 10412 bytes