Malicious PDF — malware analysis report

Static analysis result for SHA-256 306167321079581f…

MALICIOUS

PDF

68.5 KB Created: 2021-03-16 05:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 73ec249ba34f12010a73d90136a9b2e0 SHA-1: bd528e75703daa1b15b3e2bfb47156fd42b7f68e SHA-256: 306167321079581fd7a61def146d9db5b2be731e989a20843032e9f84a1cc4fb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=bissell+power+steamer+duo+pads PDF link annotation
    • http://jususozosowi.22web.org/77525249803.pdfIn PDF document text
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/8eaeb2.pdfIn PDF document text
    • https://vezulapas.weebly.com/uploads/1/3/0/9/130969209/8550a2748c74ce.pdfIn PDF document text
    • http://sujuvajilip.iblogger.org/how_to_reset_my_air_conditioning_unit.pdfIn PDF document text
    • http://libumuzu.22web.org/77241016779.pdfIn PDF document text
    • http://manapuzasupin.sportsontheweb.net/best_spanish_learning_books_for_beginners.pdfIn PDF document text
    • http://pawelemofub.iblogger.org/can_a_disabled_person_qualify_for_medicare.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/2020_beers_criteria.pdfIn PDF document text
    • https://logikepuni.weebly.com/uploads/1/3/4/4/134459966/vixafu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_8a492931b12342d9871be988150cc4ea.pdf?index=trueIn PDF document text
    • http://lekedoxe.rf.gd/sentencing_guidelines_uk_section_20.pdfIn PDF document text
    • http://kisirurozuwori.rf.gd/zilanepukawixoke.pdfIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/67331776483.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_8e355274d849448bbe97dfbc48196de4.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_f7f5c166dbe54e76b03bdd4cd35e210a.pdf?index=trueIn PDF document text
    • http://vegigekud.epizy.com/33508504458.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_d95eb7a5b6fb42d0a2b4e690a0bf53e1.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_4b65e4e4149548ceadb8bc175fc765b8.pdf?index=trueIn 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_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 5248 bytes
SHA-256: 986f9ffd51e748b4b328ed39161eec82aebdc339a74ebdb58ef0e9350f148282
font_01_sfnt_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 10980 bytes
SHA-256: d2a591a56453acba1b84f9a8ddbedf56eb2dfed258b5d63fab758f08f51a16d7

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