Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a3298651865a37…

MALICIOUS

PDF

88.5 KB Created: 2021-03-12 16:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 418a8aa2a8b91f1ecac9917d7ebee8bf SHA-1: a583610241ab59c0d3aa0adb18e75243dad783df SHA-256: 28a3298651865a378edcd4e4958dfb0d21c18cd06f05a58055c3efa037baa79a
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous URLs, including one pointing to 'nipisod.ru', which is flagged as an external URI and part of a link farm on disposable hosting. The presence of these URLs suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=is+hem+ankle+rehab+legit PDF link annotation
    • https://cdn.sqhk.co/wujakegu/cLdgjie/what_causes_turbo_runaway.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/gegig68/jotidejiwirewidige.pdfIn PDF document text
    • http://xuforixek.22web.org/portable_phone_charger_for_samsung_galaxy_a10e.pdfIn PDF document text
    • http://vafakewa.iblogger.org/championship_manager_03_04_scout.pdfIn PDF document text
    • https://metuwudoguwo.weebly.com/uploads/1/3/5/3/135323448/4600941.pdfIn PDF document text
    • https://puluwasazos.weebly.com/uploads/1/3/1/6/131606552/nunoberen.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/igB6jju/polaroid_originals_color_film_for_sx-_70_4676.pdfIn PDF document text
    • https://cdn.sqhk.co/sapamine/gFfKvjb/84243537673.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/c5AjeyV/85469833805.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tamugaza.rf.gd/geworurero.pdfIn PDF document text
    • http://fopopas.epizy.com/t_shirt_template_vector_green.pdfIn PDF document text
    • http://sizafezofaxa.epizy.com/5930659463.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/wulawaposolabizarasaje.pdfIn PDF document text
    • http://sofesikilotuxu.rf.gd/blueprint_to_cut.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/rofop.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_a202d6126fd4447186093f1043594486.pdf?index=trueIn PDF document text
    • http://nebovorem.epizy.com/dexezabevejopoter.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_515f4f1e37474be08fa1a3345740f2fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/application_for_marksheet_verification_gujarat_university.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_d0d65b81fb49489082debe997ad54070.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 4920 bytes
SHA-256: 5111dd79b6cbf52d7a0f370241627e537460b88996b3edd50ba7c2a98897c8d7
font_01_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 11452 bytes
SHA-256: 35e6b3903ab144f8530fd577855596995c08292aaac3be204488c71ab4f6cf04
font_02_sfnt_off000146a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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