Malicious PDF — malware analysis report

Static analysis result for SHA-256 673b2cd897176c63…

MALICIOUS

PDF

71.8 KB Created: 2021-02-01 23:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8a0e966b26289d54f2ae01bf2ec0feb1 SHA-1: 1ffdd36f6c913298a2a34a0e615ca93b8c48db58 SHA-256: 673b2cd897176c630c091c307f8b667e96f7f164dd9f4a8004aede6e01ef6688
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with several pointing to disposable domains and acting as a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Apple airpods a1602 manual', indicating a lure to trick users into downloading the malicious PDF.

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://seumenha.ru/123?utm_term=apple+airpods+a1602+manual PDF link annotation
    • http://copyrightshelpscenters.com/promissory_note_in_telugu_format_downloadtrcwp.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/hdjjAmv/dragon_warrior_3_gbc_game_genie_codes.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/4823d6fcc2.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/rawimevatogemibewogikob3hotv.pdfIn PDF document text
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/xaborurinub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5fe8104d15aba.pdfIn PDF document text
    • http://just-gopro.com/dinode4uf2k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5ff507350cf1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_5fe292e79c6b7.pdfIn PDF document text
    • http://logmeinnow.xyz/55778798707zy6ck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fe826d2e602e.pdfIn PDF document text
    • https://fojugifobuko.weebly.com/uploads/1/3/5/3/135328464/6ca9c8baff06d.pdfIn PDF document text
    • http://item-mask.top/hydroxychloroquine_retinopathy_screening_guidelinesz4rwr.pdfIn PDF document text
    • http://wersita.space/circunferncia_da_cintura_e_risco_cardiovascularj7dzs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 5572 bytes
SHA-256: 304e32cce9c747945b38f8862d9d6a093c4f9fdb468633f36212fcfc26a26ca0
font_01_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 11484 bytes
SHA-256: c485010cef2960a5a72492cc06b010ddb5b1fd2fa36dfd665b49f763f3fe7862

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