Malicious PDF — malware analysis report

Static analysis result for SHA-256 11363f8dc391ef73…

MALICIOUS

PDF

76.6 KB Created: 2021-03-06 23:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ef62e77aebf89443867c2502570e5e01 SHA-1: 7ba4874e9c873d5ed906b4dbfae80948ebd4a205 SHA-256: 11363f8dc391ef732ecaf903e990aadcd2cfb792e22c148a8314b24220921c30
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated maliciousness. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' in one URL indicates a potential phishing or tracking mechanism.

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://dugedepap.ru/strik?utm_term=winter+family+feud+questions+and+answers+pdf PDF link annotation
    • http://de-bewertung-id-q2e5t23.top/green_bay_packers_pumpkin_carving_ideaskrwlc.pdfIn PDF document text
    • http://phillipen.online/feminist_film_theory_explainedx3awb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490523/normal_5fedde2bc2227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_60311b1659e2d.pdfIn PDF document text
    • http://sedouche.xyz/45507772857j9ky1.pdfIn PDF document text
    • http://itnegozio.info/82127573422b6xj0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5fdb99f3be3d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5ff003ed6f8b1.pdfIn PDF document text
    • http://xakutovudo.iblogger.org/xukemepituti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_60414c238da64.pdfIn PDF document text
    • http://summerita.fun/carroters_grinders_manualq790x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385427/normal_5fc692d52bdef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_60409d97d9a09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_8ae5b3f52b774b78b92d3b25f343de8d.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_5dd2cfd3a04a4f4c8ca57292774f762e.pdf?index=trueIn PDF document text
    • http://sulupajus.rf.gd/how_to_train_your_dragon_3_on_netflix_canada.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_d0f4901d04844a5eaef2fcb58d692440.pdf?index=trueIn PDF document text
    • http://bitugoxopezuwu.rf.gd/81701743721.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_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 5520 bytes
SHA-256: 0b5e5effca21a0aef43fa3f94f0842dd148bb33e08c185ae1b7a71e8ce510585
font_01_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 10196 bytes
SHA-256: 456d2b4efab92cc9490aaa145cece87b07d19db1e208c3ecc0092ad05b4ab014

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