Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2479d187044eb90…

MALICIOUS

PDF

112.6 KB Created: 2020-12-16 20:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 752ecfe209a6b985e0618063f8f5aef5 SHA-1: 0783fc6f7eb854cbfafeb7dcc4494b787cea1a32 SHA-256: b2479d187044eb90558cfe95db96e9dd6cacb6fb07483dd949280d037da3ab40
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. One of the primary URLs, 'https://trafficel.ru/strik?utm_term=state+v+alston', is likely used to direct users to a malicious site, possibly for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the idea that it's a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/strik?utm_term=state+v+alston PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471988/normal_5fd7741e427ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_5fb8c01c930bd.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/sokurinom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_5fb88cc69be03.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/begaxijaroruzux-tewiguzudafore-bazota.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/gomowuwuti_tuxowaxij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5f9f8a4a03690.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/memeresidu_papivasebur_wawujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5faab5dd8213f.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/408440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc653a55bcb0228a2a7847f/t/5fcf288e10aae775716b003c/1607411855245/cartoon_wars_blade_mod_apk_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e46d04e-ef05-4e11-a8b9-17c0d66d08de/7-2_similar_polygons_glencoe_geometry.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf44e5c7695ca99b2c1d/t/5fc25d42fa04221c716c2eb2/1606573378998/nifudew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50bbc92c50b1a1e921daa/t/5fc62bae3570fb44d1d5179f/1606822831460/ez_top_up_grenada.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10ac260f2895dc1e8a19d/t/5fc51ff7bc819f1cf47caaa4/1606754296547/international_mail_manual_part_135.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_off00017fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FEE 4748 bytes
SHA-256: 22742f87db8eaa3e680cf22fd67d47c768e1aa650a1654fa3c5b1df2e2ea1345
font_01_sfnt_off00019026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19026 10908 bytes
SHA-256: 9d00143fa0ea744ef2a8170b91338b736a5219e456ee7dbb2fc09f4f8dc9ef90

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