Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faaf4c4d4268f31…

MALICIOUS

PDF

65.8 KB Created: 2020-12-22 15:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0691a4f147b6786a862f170289fda18c SHA-1: b44b69d9e3330e000d871430bf0b0021a8029120 SHA-256: 6faaf4c4d4268f31ece42d2bae6da5e577697e9ddac959eef58e2b9bd28af185
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains embedded links designed to redirect users to malicious infrastructure, such as 'https://traffmen.ru/aws?utm_term=4th+grade+spelling+words+pdf', and is part of a link farm pointing to numerous other PDF files. The document body, though heavily obfuscated, suggests a lure related to educational content to mask its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=4th+grade+spelling+words+pdf In PDF document text
    • https://vepazigomopu.weebly.com/uploads/1/3/4/3/134398405/genitetikov_midelugote_wejiziguvuxakud_mitefakurel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_5fdb2b7d4673a.pdfIn PDF document text
    • https://fedobakeruja.weebly.com/uploads/1/3/4/3/134367732/napunemosawizit.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/9719974.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cae5eb4-4405-4932-8744-add89c7bec28/science_fusion_matter_and_energy_book_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a4a434-5389-4035-b42f-f0ecf4fdd7d6/42051045135.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/30630758810.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/guided_meditation_script_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd593bc5-67a3-45b6-b686-6e2c4aa5832e/wii_motion_plus_remote_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08173c6a-aedf-4d34-9dfe-e893d53018f8/sovifobofamid.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/45940480555.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/21417882701.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/zulivositetaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df05c4ec-9d59-4002-b81f-ca78a7a6cc49/austin_stoermer_coleman_instagram.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_off0000c421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC421 5388 bytes
SHA-256: 203744e76ab5bb73ac2ea505bcb7df5f295de3ee2827fabe2ed1f691c6b082a9
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 10468 bytes
SHA-256: fdf2b32aec852604f67aa970f77961d1da3f35a7871f85b934251054d8206faf

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