Malicious PDF — malware analysis report

Static analysis result for SHA-256 3159ab90d340c911…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 11:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 929fb9e21588fd086cdf84d6eadacb8e SHA-1: bc51cfdd862d163cdcfde1cacf41551b573a5d38 SHA-256: 3159ab90d340c911157ea9f17adb5268495fb457d20950d528a1335f1795ef08
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=bacillus+thuringiensis+plagas+que+controla+pdf PDF link annotation
    • https://cdn.sqhk.co/sepokafaru/2gej2hd/disavafepijedaxinigekabig.pdfIn PDF document text
    • http://vevapefin.sportsontheweb.net/what_are_the_three_types_of_plate_boundaries_and_how_do_they_move.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/8914919788.pdfIn PDF document text
    • http://xufuxenu.mypressonline.com/mojepenifi.pdfIn PDF document text
    • http://pagebake.com/sony_wh-1000xm2_pricespyqcb3f.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/35863296528.pdfIn PDF document text
    • http://beautysss.site/jack_reacher_film_2012_castjsek0.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/gdetgeR/mekiji.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/6c100e.pdfIn PDF document text
    • https://jowozulabu.weebly.com/uploads/1/3/4/0/134013075/8457931.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/d163c9d82f16.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/FMgejcE/castaway_burbank_all_you_can_eat.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/thdjfJc/download_piano_tiles_3_pc.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/denon_avr_591_remote.pdfIn PDF document text
    • https://tafanavudijis.weebly.com/uploads/1/3/5/2/135299899/2206047.pdfIn PDF document text
    • http://beliyden.xyz/liwumuvodapuparijomobudi48x49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aea7ce-1d60-4752-92e3-934ef1c5f201/99913234892.pdfIn PDF document text
    • http://nubirumoxid.onlinewebshop.net/acc_annual_report_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c68d7a-e6aa-4d65-a02b-5809425d54e1/60150369291.pdfIn PDF document text
    • http://kipejefanowisu.atwebpages.com/39828585819.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/venture_capital_and_private_equity_a_casebook.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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 5592 bytes
SHA-256: af7ca6b7c2ca3a4f7ecc89823ad73f50d3c5752b586cd4fbe79f131343ea6849
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 11720 bytes
SHA-256: b7055fb716a79c0ac9cc7f287cdbf43e4d9b03ebf69f011e1092144c50836a90

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