Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86c6962b9c09f99…

MALICIOUS

PDF

77.9 KB Created: 2021-02-17 16:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 470d61ec0533c2b509b2a2f487a583bf SHA-1: 570e639597f6b6009dc392316e6c5a94c838708f SHA-256: e86c6962b9c09f99c2eaed16ad32d24c53ea5869f3a03f0c90df345eee75f536
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious content through numerous small, seemingly unrelated PDFs hosted on disposable domains.

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://baarspo.ru/123?utm_term=what+does+the+name+brown+bear+mean PDF link annotation
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/0a5491486ea9.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/0HeW74d/kci_airport_parking_coupon_2020.pdfIn PDF document text
    • http://naturagrush.space/chapter_5_vocabulary_practice_economics_crossword_answerslmxs1.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/Tihmggh/jhu_apl_remote.pdfIn PDF document text
    • http://dnepr24.info/wawimokiruvedawetopil25gdy.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/jUhhvja/amazon_echo_dot_price_in_nepal.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/433971.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/how_much_do_e_commerce_models_makej9t8m.pdfIn PDF document text
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/futeriseje.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/f99fea5.pdfIn PDF document text
    • http://mifvideo.space/ahsoka_tano_voreul09o.pdfIn PDF document text
    • http://ca-manalapan.space/dnd_unearthed_arcana_roguelpgqq.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/j5DR69P/bass_pro_shops_black_friday_2020_ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojetewope.epizy.com/piano_chords_audio.pdfIn PDF document text
    • http://vibupozikijebi.rf.gd/uc_browser_mini_old_app.pdfIn PDF document text
    • http://sotatelovutegep.epizy.com/tropical_house_radio.pdfIn PDF document text
    • http://juzelipa.rf.gd/88205319432.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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5280 bytes
SHA-256: 5df81c52a87bf3d148247a3ddd3ada654761594af7b1064b7c606a0d3a8d5042
font_01_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 11748 bytes
SHA-256: 4652b82569f0d70d1ada6cd8b113048614fe7ae5959a26cc20a984696c8bba54

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