Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e96ca2aae19fcd…

MALICIOUS

PDF

71.8 KB Created: 2021-02-12 13:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8b51d68e44488668b42a4073e1821a1a SHA-1: e861c06257efeebd489ae59d7ce046fdbd5af368 SHA-256: c7e96ca2aae19fcdb689a85f11325326319ee1ab06562293bfe5c3f123a8357b
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a link farm designed for SEO manipulation and potentially redirecting to malicious content. The document body, though heavily obfuscated, suggests a lure related to 'easy general knowledge trivia with answers', aligning with phishing or scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=easy+general+knowledge+trivia+with+answers PDF link annotation
    • http://womans30planet.com/telsta_a28d_manual4be91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcca6b3009cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_601b3b6437c98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fd82d6368da3.pdfIn PDF document text
    • https://cdn.sqhk.co/pojukitogex/agihhhg/79413046809.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/cU3hgjh/29778228539.pdfIn PDF document text
    • http://nimened.66ghz.com/nikutis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369173/normal_5ff6588f95be5.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/idAjhb2/30296833036.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/7hiFgen/20299034641.pdfIn PDF document text
    • https://cdn.sqhk.co/razonavari/opijZlS/notafogomo.pdfIn PDF document text
    • https://cdn.sqhk.co/wanuvudeb/diduVW2/among_lock_screen_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redoxewesusu.epizy.com/android_studio_3_network_profiler.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/big_ideas_math_algebra_2_answers.pdfIn PDF document text
    • http://dejupaxifitat.rf.gd/tazekat.pdfIn PDF document text
    • http://gitipezusev.rf.gd/cholecalciferol_vitamin_d3_davis_drug_guide.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 5360 bytes
SHA-256: 4cb4aebd5884f2e14adbf24dad3cc5f83888d344c0f8a64e9fc25540d60c5e54
font_01_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 10764 bytes
SHA-256: b225c0790283783d4164eab47082d018b7834dc82d0f75fdac76b7cc1d7c51c5

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