Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dac6e5bc108b566…

MALICIOUS

PDF

67.0 KB Created: 2021-03-10 08:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0c93a5c245e918613a7ac10293403b10 SHA-1: 9f40bc836077a1b650cdc379a737cd26a0fd0cdf SHA-256: 2dac6e5bc108b5666c1acec4014e562ce4618697ea9c1ddc0a8413818839508c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://bologen.ru/aws?utm_term=canon+mg3520+ink+replacement'. The ClamAV detection and ML classifier strongly indicate maliciousness, with the ClamAV signature suggesting a phishing or trojan component. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=canon+mg3520+ink+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445114/normal_602a0a54c114f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_603b1386b8474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5fe332238aec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5fcf86394ecb8.pdfIn PDF document text
    • https://gixixujenusig.weebly.com/uploads/1/3/4/6/134663953/jatazu.pdfIn PDF document text
    • https://xunujigunabiwuf.weebly.com/uploads/1/3/4/0/134017077/zowadowize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_600c09578601d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_4a40a0f772c446a48a0c9dda5e28a6d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/what_parliamentary_form_of_government.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/angular_templateurl_inline.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_496d871b9ece4a6eb526a8d37d0e44d4.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_1636e95065864130bc5a44c22e86059f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/garlock_gasket_sheet_material.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_e5307aa2198b441e82f9084774bb1ab9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xixonu/51703348223.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/tozoxezalilaja.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_ba4b7b4c2da44771b8539cde80b76f70.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_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 5604 bytes
SHA-256: 1b05f7f7623206caf1e27eccc5ec427a8b6a0860357a3155a1e64d27d0bf1661
font_01_sfnt_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 10724 bytes
SHA-256: 71b733b0b72544d3b5a5543267ae359e714d5f69466344b956f20798695a3cee

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