Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e66b7ffbc0658b0…

MALICIOUS

PDF

69.8 KB Created: 2020-12-28 00:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4ec98a6b05ecbb7845a4f8fb75f4dffa SHA-1: efb30eeb4a90fb4bd69a9c68283c341aa1e65b22 SHA-256: 8e66b7ffbc0658b019220b32d4074de5d02fb21ce9131c14431af36944516d39
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'math lesson answer key'. The presence of numerous links to disposable domains and link farms indicates a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://trafffe.ru/123?utm_term=faceing+math+lesson+14+answer+key PDF link annotation
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/7396712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_5fdbd085d5239.pdfIn PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/2659458.pdfIn PDF document text
    • https://mitixofixomu.weebly.com/uploads/1/3/4/3/134333727/popidodakoze.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/NWchaV9/vawoxukizoragojara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5fb5ba8246a03.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/kakegibefokow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b992a4-7111-4351-9eea-960e287785b9/65612725849.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/contexto_3_la_poblacion_y_la_demografia.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_off0000d3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 5564 bytes
SHA-256: a9c74269a386dbed21bf3436019206815e1e2cb1d6b1f0c5c92e7bd15d2b03eb
font_01_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 10692 bytes
SHA-256: fcb4981273a3911e5db8cbe61611a0ef3cfedf0844d55dc3a371701bff28c3a3

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