Malicious PDF — malware analysis report

Static analysis result for SHA-256 1991042ff0c3f2fd…

MALICIOUS

PDF

76.2 KB Created: 2021-03-12 01:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ac16d68b634def57ff546209b0461dd2 SHA-1: 7ac3d8faea75375d32d95d924d4324c46ba12ce9 SHA-256: 1991042ff0c3f2fda0898720c62b8c258c36e6beec86a8f0864907ed80677bea
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'bologen.ru', suggesting a phishing or malicious content delivery attempt. The presence of many links on disposable hosting further supports a malicious campaign.

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://bologen.ru/strik?utm_term=graduation+maya+angelou+sparknotes PDF link annotation
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/temosizaxog.pdfIn PDF document text
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/2026086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5fd0aba677cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6029515b718d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5fe13b8539abb.pdfIn PDF document text
    • https://wufopuse.weebly.com/uploads/1/3/5/3/135300065/pinonopuxivuniv_buruz_lanaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_603f099367951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_602610908d9aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405907/normal_600773fc5e68a.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/vexeliku/91507579414.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/chinese_films_2017.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_068d92a2841d4cae9b595a319d20eb6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9379e085-7f5a-4c17-9005-64d8ea9e0ecf/58999111179.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_4223360cf90a4e338308e598fa749d4a.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_6d087ac85fe94091959ce9e52205af16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/cbse_class_11_english_article_format.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_4bcdb4a6da594a6fbb721cc702f8ac3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8d8d64-9087-4c55-8a02-67e99ffb91b6/76234924736.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_aa2d207262c8496eb52992d3ce1d8aa9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/31898677415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f82619d-1df4-48c8-b6bb-d327d1b1d0e7/what_are_the_ethical_teaching_standards.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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 5476 bytes
SHA-256: 06270329e071400bc49d26dcb0cb56efba85c0f70e3273520d2b757dfdc4db75
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10404 bytes
SHA-256: 5f7c9e5a6411c11372600c3d00173f43a161af9ff1bbc794314a12623d00dad2

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