Malicious PDF — malware analysis report

Static analysis result for SHA-256 8562b87593200f47…

MALICIOUS

PDF

93.8 KB Created: 2020-11-10 19:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cb5e8a7f8ac40f86062296904a388f30 SHA-1: d41a19121dbd724fd55711511c546e2342fa1252 SHA-256: 8562b87593200f47cf06bf8fae9a82028700d41f70ee6b5958ad78316222e920
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malicious redirection attempt. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://ggtraff.ru/123?keyword=series+circuit+worksheet+pdf In PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/taxasafavo-walavito-tonifugobukim.pdfIn PDF document text
    • https://juregirezixo.weebly.com/uploads/1/3/4/4/134401856/4499485.pdfIn PDF document text
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/7f2b4a6a7222.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/tenunud/59122602037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fec55f-e31b-4aeb-b4b0-923203608404/50991683361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717206e9-6486-4db9-9ec2-7a5933dab723/blue_harbor_auto_loans_bbb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51577bad-ba12-48dc-81ff-4f8125950d87/pukovaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff4a884-7a9f-480b-b773-69394ce811e7/stick_war_3_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad07e926-cbcc-4fd9-91f5-28ba69d8e70b/2960158455.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/95184781309.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/age_of_exploration_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d374e6-0a01-46f1-9db3-dad4be7aad33/21611908703.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_off0001337c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337C 5260 bytes
SHA-256: 1b2dc924faf41f0d4751a9bd1fdd310868b636917e2f07b5528681a698883227
font_01_sfnt_off00014579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14579 10872 bytes
SHA-256: 09bdb083e5e5a82d5372f697c7eda4789098f4b0a154bae3f1433254e76b3ae6

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