Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ffd3af42d8d602…

MALICIOUS

PDF

60.2 KB Created: 2020-12-18 23:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313002491a20e8ac31ac1960613da359 SHA-1: 4f14c663bdf09a424ed424969fe83a7fe33a1ab6 SHA-256: 22ffd3af42d8d602acdce95e86b63a132970533cee679063dea8496341d02851
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The embedded document body, though heavily obfuscated, contains text related to 'how to lock a chest in minecraft xbox one', which is likely a lure to attract users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://trafftec.ru/strik?utm_term=how+to+lock+a+chest+in+minecraft+xbox+one
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/fuzalenuzunisew_venunerol_bagilakujop_jupopijujifufez.pdf
    • https://pusifife.weebly.com/uploads/1/3/1/4/131407530/a31b7.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/43a349bf4de6ea5.pdf
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/8529462.pdf
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5f901af92ae60.pdf
    • https://muxosafexokole.weebly.com/uploads/1/3/4/4/134485240/ebef0f20e.pdf
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5fb043703e6cc.pdf
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/2125395.pdf
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5fb5905066c63.pdf
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/e2e19134c4ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/502575b9-b4c2-4284-abef-5a816dc3c236/4590495172.pdf
    • https://static1.squarespace.com/static/5fc170aff7cf8c75402ec1d3/t/5fc4d82acb3e0f5771e7b496/1606735914647/ca7_scheduler_documentation.pdf
    • https://uploads.strikinglycdn.com/files/60dcf031-0bd1-4277-84a2-12138b89b3d2/zoludirixubimunogixudetu.pdf
    • https://static1.squarespace.com/static/5fc0d0065e8e827d428d60b5/t/5fc1fa557acac6192a072e5e/1606548054517/bike_fork_mount_through_axle.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_off0000ae28.bin
782b0f617920b02e4c695db239460bc0560f9e4db2173722b8a27880cfd0484e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE28 5448 bytes
font_01_sfnt_off0000c098.bin
c27cfa5dc943c669e237ca18b0c6ab9d8c13c04726b0014ef0ad63bf51a24ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC098 10392 bytes