Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07c806f642e9ae5…

MALICIOUS

PDF

75.0 KB Created: 2021-04-07 04:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a469ff6da5ce7869ee1916bc57296be7 SHA-1: 3cb0f8d9facb2f312602fcd1a0da288c57fae442 SHA-256: a07c806f642e9ae503b4e1f8817044649b159b828a4ab8a79a4266d8c2332e88
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'Axel f easy piano sheet music pdf'. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a malicious intent to redirect users to harmful content.

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://ponafet.ru/123?utm_term=axel+f+easy+piano+sheet+music+pdf PDF link annotation
    • http://samozanyat.info/bulldog_vaults_bd105080aul.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/gia6cbm/the_walking_dead_season_one_apk_mali.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/f4XpHqj/world_cup_2020_qualifiers_wiki.pdfIn PDF document text
    • http://detonic-official.website/lifamorwvjuf.pdfIn PDF document text
    • http://naturalgood.space/13833323023md1s3.pdfIn PDF document text
    • https://cdn.sqhk.co/gadowikuxe/oTLMjsD/edmentum_assessments_answer_key_algebra_2.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/gfQkHSz/85435764005.pdfIn PDF document text
    • http://idealicaitalia-official.site/best_dish_receiver_in_pakistan_20204rx0s.pdfIn PDF document text
    • http://copyrightshelpscenters.com/sikawit393kp.pdfIn PDF document text
    • http://shopeuro.pro/70544999079dixt6.pdfIn PDF document text
    • http://creamwalls.space/kidepuvagabobuseboludo4m7fg.pdfIn PDF document text
    • http://itash.space/purple_rose_wallpaper_free_for_mobilebcr8p.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/nefunupu/daily_math_problems_for_middle_school.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_a63651f7721545edbfb2ff58a170c62b.pdf?index=trueIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_e0e207a5f8c4428c9d7e8bd7a6e8a267.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/12576946724.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_36d4cc261bb0487981b53d0ea159eb4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/30463402702.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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 5456 bytes
SHA-256: 1d9b4a2f1b29f57fdb51059b921437a8acd29e52ac7571b63a01aae1e9e6024f
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 10836 bytes
SHA-256: e45389edc7861cbe475419382f90a2b019f380c70b1639efcad4b4571e9a6d1f

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