Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f3f87d2e3a0c0b…

MALICIOUS

PDF

75.2 KB Created: 2021-02-12 20:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 27d66dbb81bdada9b686a970f5d03497 SHA-1: d12fd519a8f168c005b61f902f0df5bf1debd396 SHA-256: 23f3f87d2e3a0c0be99536621ec9b740654ebf256fb0177fb53789dea6057cd9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a tactic to obscure the ultimate malicious destination. The document body, though heavily obfuscated, contains keywords related to popular mobile games and hacks, likely serving as a lure to attract users 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 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://jacksth.ru/wix?keyword=tutuapp+apk+pokemon+go+hack+android PDF link annotation
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/voropegu.pdfIn PDF document text
    • http://trokot-roznica.xyz/7421340350584229.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/2473780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_6016c400c247a.pdfIn PDF document text
    • http://gsmall.space/apostila_biologia_completajzv4v.pdfIn PDF document text
    • http://zuvibig.22web.org/datacamp_python_cheat_sheet.pdfIn PDF document text
    • http://vusejulene.iblogger.org/algebra_nation_geometry_answer_key.pdfIn PDF document text
    • http://batmbatm.ru/xekugezojarugejuwuzukijomziok5.pdfIn PDF document text
    • http://teenagetutor.online/ultimate_steel_robot_fighting_hackknt8x.pdfIn PDF document text
    • http://stavki-na-sport.site/ponulapbrxp.pdfIn PDF document text
    • http://nudistoff.club/juwavejaxelosuloluxajovow2s3nh.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/e22b403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5fc993bf29ea9.pdfIn PDF document text
    • http://abwaab.su/reasonable_faith_christian_truth_and_apologeticsfx4qe.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/litudivekonekilona.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/4590643.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/6652685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sedoguzod.rf.gd/23501798777.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_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 5288 bytes
SHA-256: 0d8c049c8244daa6b56fea2e7cf8ff5bc082bf51ef02f7960ff5afffa561dd5e
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10212 bytes
SHA-256: adad500749f1d3a260b7768ba464d0ad6a2839626ebf0601126cf0b37f2309ef

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