Malicious PDF — malware analysis report

Static analysis result for SHA-256 29dcbcc1cf8f5e7e…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 11:11:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ceac8e206782050054c7b99bdd929adc SHA-1: 7efd54d1222dd1f2056823f2f79c62842dbe4a39 SHA-256: 29dcbcc1cf8f5e7e48c5a76e9c7135ea3f00693fd4471b98f5da237cfb205e39
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=how+to+draw+a+human+body+sketch PDF link annotation
    • http://fosinofabeveso.22web.org/vogonoxe.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/3261601470354aju.pdfIn PDF document text
    • http://ritual-venki.online/270_derece_dndrme3autu.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/sivujaxe-xobob.pdfIn PDF document text
    • http://mkr-olimp.info/temerekusewulinozdsu49.pdfIn PDF document text
    • http://sbrf.link/86485324537pmsq5.pdfIn PDF document text
    • http://naturagrush.space/sitexudewifukanowewoxamwwer.pdfIn PDF document text
    • https://subafoxa.weebly.com/uploads/1/3/1/3/131379179/6183267.pdfIn PDF document text
    • http://sokadap.22web.org/meri_pyari_behaniya_banegi_dulhaniya_song.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/bezegoluzose/99417269363.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/coffee_mug_design_template_free.pdfIn PDF document text
    • http://xofukadebinomo.epizy.com/6484844120.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_20f7bee95fef42eb9c404b465822da6c.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_50b816d541254c96bc5baa1f66028f7f.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_e9ed413c6b6a4365a7f1ec506923d7c2.pdf?index=trueIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_c8d27b378465415485e5b1528abcaf58.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_162fc28a29ea4874b3b5811dfdb62e24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/7135302591.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/how_is_critical_thinking_related_to_information_literacy.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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 5504 bytes
SHA-256: bdc4f8c96e1414f7bc7c0b5de0f85e7963632a2ba18d98f4155603619e0e3436
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 10804 bytes
SHA-256: b28379900c8fce7dddb4bbacf9e93365167ef8f40b3b0e23e7ca81cfddba5b2a

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