Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b799ae9310df56…

MALICIOUS

PDF

82.5 KB Created: 2021-03-01 22:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f26ca0907181efa2f83d0efcd53d5635 SHA-1: e1c95da238f122a7acdf191ebcca4a142135e85a SHA-256: b6b799ae9310df56a5d4ed749363158ee08440e4f9ed95ef7a9ee3f0701e63e0
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its construction. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious sites.

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://xezojetit.ru/strik?utm_term=drown+by+junot+diaz+essay
    • http://omynutural.space/limokibuccqbv.pdf
    • http://wazepewazivulil.mywebcommunity.org/how_to_unplug_sunbeam_heated_blanket.pdf
    • http://spindlndou.space/pozozuferofemokyhbjh.pdf
    • http://ch-redirect.icu/repezutikikajunojusavororiosmf.pdf
    • http://fdvsefwfrw.space/bayesian_analysis_for_the_social_sciences6kzr2.pdf
    • http://femuxeririta.mygamesonline.org/romeo_and_juliet_comic_book_summary.pdf
    • http://lirinevewafa.mypressonline.com/fosejajosaritexurij.pdf
    • http://5coupons.info/hamilton_beach_flexbrew_clean_cycletkvlk.pdf
    • http://velavedi.iblogger.org/walojakanekapag.pdf
    • http://stroiline74.ru/84819394855dh81w.pdf
    • http://tiwimifozukimu.medianewsonline.com/how_to_change_lg_tv_screen_resolution.pdf
    • https://cdn-cms.f-static.net/uploads/4499282/normal_600e8674d78a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gofosuxubajo.epizy.com/duxafo.pdf
    • http://tisilakifejil.rf.gd/what_is_a_behaviour_support_plan_in_disability.pdf
    • https://s3.amazonaws.com/debamijizozexo/bhojpuri_gane_video_mein.pdf
    • http://sotatelovutegep.epizy.com/92653354227.pdf
    • https://s3.amazonaws.com/bogeguva/autumn_ppt_templates_free.pdf
    • http://vurasoda.rf.gd/apparel_manufacturing_sewn_product_analysis.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_off000106f9.bin
d455d77b3046940c708f4fe5b70d38e9459b619c704ce75ab54c3de80159ed15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 5244 bytes
font_01_sfnt_off000118fe.bin
8bf3448e5e9d9b8a4127a1b7b126367344be055c38bf6f04d629c037f337c3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 10380 bytes

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