Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8990573d35527cc…

MALICIOUS

PDF

77.4 KB Created: 2021-02-27 12:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 490580619db0b8dd2cca8af0b5ce2e8d SHA-1: 73d7e5a68b6ed89e5e1954e17205eefbc6185ccb SHA-256: a8990573d35527ccf92e7c8516937374a5bced7b37c92425f5d65f4909e223ad
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 numerous embedded URLs, many of which are hosted on disposable domains and point to PDF files, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, specifically a phishing or scam operation. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=is+blood+of+elves+the+first+witcher+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368266/normal_602414319c63f.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/lojemebezozaja.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/f7QwWQo/5474273790.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/aqgi3fD/dj_song_mixer_app_for_android.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/introductory_to_multivariable_calculus.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/hhfsjdq/bowetejuletusenog.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/32662326305.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/jaqgcie/air_jordan_12_racer_blue.pdfIn PDF document text
    • https://wuzakadebetes.weebly.com/uploads/1/3/0/8/130814976/f708f02be165.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/kindle_fire_hd_7_3rd_generation_cyanogenmod.pdfIn PDF document text
    • https://dorakipep.weebly.com/uploads/1/3/4/7/134747047/5400004.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460446/normal_5fff81a0a5377.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/tozujote_mujijebopo_zimagefew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376379/normal_60053c6647b58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5ff775308b0fa.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/dakebesuvum/laxepidabagamew.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/dikebalezigivegokawesip.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/jonalexep.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/how_to_train_your_dragon_series_books_in_order.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/sales_manager_job_interview_questions_and_answers.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/system_requirements_for_shadowlands.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/videoder_premium_apk_latest_14._3.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_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 5192 bytes
SHA-256: 8a263dfe9c67a3b68f9334e463735d534400ccd021b491a5e037cc8705a32e50
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 11572 bytes
SHA-256: fc213498faf185b318e00a0827abf9ff8de77a1fbeecd9b1bafec692606eb6c8

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