Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8bff8ac6a1b43a…

MALICIOUS

PDF

78.3 KB Created: 2021-01-15 09:34:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3f9210cb8a3fa56f389ebcc98f895df6 SHA-1: 2bdfd955028b449e6e5eda88fe190a2df2c08be5 SHA-256: 2f8bff8ac6a1b43a8c1d1faa283a36401a7d9145ff6a36c59b1459a8ce5fb925
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to an 'answer key', and it contains an embedded URL pointing to 'trafffi.ru'. This URL is likely used to redirect the user to a malicious site for phishing or to download a secondary payload. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=chapter+6+population+and+community+ecology+worksheet+answer+key PDF link annotation
    • https://site-1246945.mozfiles.com/files/1246945/rimivigujikolet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_5fda0f7145942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498645/normal_5fe077ea61793.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/9655948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454055/normal_5fed22f9aac9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f9315b5b8d1e.pdfIn PDF document text
    • https://xowanejizaki.weebly.com/uploads/1/3/1/8/131871556/tutikoju_luvojuxapoja_zulalekejege_vefamirogojovan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5faabbcb496c6.pdfIn PDF document text
    • https://site-1168260.mozfiles.com/files/1168260/78120324271.pdfIn PDF document text
    • https://site-1175442.mozfiles.com/files/1175442/super_adventure_of_jabber_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupimaral/mv_blackpink_whistle_japanese_ver.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/55946515432.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 5804 bytes
SHA-256: e74e8e590fc1912f6368c59d85ef27ec6e6bf59f5461cb8a4793904625234947
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 10712 bytes
SHA-256: 1a4b76aea193eb3a258456966e147d711a2564bd8a17048bd2f2f7a3def4184e

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