Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b7fde846aada96…

MALICIOUS

PDF

85.8 KB Created: 2021-03-10 14:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7ea7188cb6de8f3e80e11bfb0dabf0b SHA-1: e65b7fd0d6a7d94c0852ee516e6651f1f42a8123 SHA-256: d7b7fde846aada96ca72f470c02cd049ef6beb04f4d0c342d1a8a575c5a5f876
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://ponafet.ru/award?keyword=angle+bar+sizes+philippines+pdf
    • http://vovpomnim.ru/tejedopiwufewavidafemamuswytxa.pdf
    • http://pugorot.mygamesonline.org/2018_jeep_grand_cherokee_service_intervals.pdf
    • https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/ladepejujozeles-kaseba-pexaje.pdf
    • https://jetezilim.weebly.com/uploads/1/3/0/7/130775858/9b328c42e146.pdf
    • https://cdn-cms.f-static.net/uploads/4415754/normal_6033f926bfa49.pdf
    • https://cdn-cms.f-static.net/uploads/4379482/normal_604345b061b26.pdf
    • https://cdn-cms.f-static.net/uploads/4384472/normal_60300fd97ec86.pdf
    • http://paselon.getenjoyment.net/allpowers_100w_portable_solar_panel_charger.pdf
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/vowuzuxetas.pdf
    • http://jizerigozigalav.getenjoyment.net/by_products_of_sugar_industry.pdf
    • https://cdn-cms.f-static.net/uploads/4408866/normal_6015ecc950a72.pdf
    • http://satofaxa.iblogger.org/64132876982.pdf
    • http://vijexibat.mywebcommunity.org/classical_guitar_tabs_free.pdf
    • https://xemexetizepe.weebly.com/uploads/1/3/6/0/136094173/7271512.pdf
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/sokowurowifas.pdf
    • http://reduslim-italiaoficial.site/xalutedar9m0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lofese/78645946763.pdf
    • https://s3.amazonaws.com/kelukakeb/blockly_games_music_answers.pdf
    • http://zokitamuna.epizy.com/34806619201.pdf
    • http://deriwabip.epizy.com/journal_of_magnetic_resonance_imaging_author_guidelines.pdf
    • https://s3.amazonaws.com/ragejufa/earthquake_intensity_scale.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_off000110b9.bin
a1712e8747f6ab747eae9806e158d19927e72ee97c6332d85d20a544c7ce67de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 5480 bytes
font_01_sfnt_off0001235c.bin
b1b2e125aac4325c311551b80e5ef1b912338dc3f8f3cd602a466f37d9b62c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 11284 bytes

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