Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b18b4fe7b1cd55b…

MALICIOUS

PDF

73.7 KB Created: 2021-04-26 06:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a3098f16967ce2d59d2fb70aec2fe049 SHA-1: 26752a350604c90f0d3a192e26b03ba885615989 SHA-256: 8b18b4fe7b1cd55b73be33a58e369c6cf16832b63f6c02c7c196aab942d8f7a9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://seumenha.ru/strik?utm_term=trig+test+prep+review+answers. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/strik?utm_term=trig+test+prep+review+answers PDF link annotation
    • https://gifukupuwabe.weebly.com/uploads/1/3/0/7/130775529/fomovur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386824/normal_60014ccef1623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_604eb18976db0.pdfIn PDF document text
    • https://sopazavevorud.weebly.com/uploads/1/3/4/3/134370644/9238903.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/wokesabisevo/90128115944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e84f88-ea30-4dda-a806-d22ac85fdc5a/english_vocabulary_words_with_meaning_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/echo_weed_eater_srm_225_string_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5041c2-5ade-4258-964e-e3ba72ef4365/29477306448.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_9fa2b60aaed94348bd79b4f4abb6346c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0cf6dac-7b65-40af-9203-3a15165ff4c3/53240592989.pdfIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_dcdb35b0ade843a9a267aacdf354ff93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78b6fec-f226-4a40-9c27-800674f88d6b/altered_carbon_season_2_characters.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_69f01de5cc6042fa867807e468b217aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e44153-96e6-4aff-9685-d8262e157f2a/never_fade_away_find_the_mainframe_cyberpunk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d56ae3f-379e-4984-a1aa-8be7ee7fe314/8551847152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19bb421-ea21-49b5-9d56-31bcdddfe62b/61787345795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/353f4b70-7624-4396-8b03-b6626f5451a2/paintball_places_near_me_prices.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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 5056 bytes
SHA-256: 694818e2e28d43fda8856a7bc538f01c9595d44e1b47634cd3cb479063078bcb
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 10980 bytes
SHA-256: 56748230c8ac26023072584e7b631f51db3701bec43d8b595457216689405ee9

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