Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4eb0d9e928de35…

MALICIOUS

PDF

74.5 KB Created: 2020-12-09 04:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b9b0c5844e03748bccb9ca85f591c5f7 SHA-1: 2c68054c5322fe4169628bde61ec2e732ce819d6 SHA-256: 8a4eb0d9e928de3533d35a45553405a2b52e8393c47170337fb5fb91c5dc3608
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'traffking.ru' and another to a large list of PDFs on AWS. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful sites, possibly for phishing or to distribute further malware.

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
  • 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://traffking.ru/strik?utm_term=jokes+for+adults+clean PDF link annotation
    • https://namuxewanazojo.weebly.com/uploads/1/3/4/2/134266474/kaxanakafu.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/1981962.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/bejokazemur/mexican_cornbread_casserole_with_creamed_corn.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/pedadibupog.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b629affbf90a66e985ea/t/5fc10c6a08845d0924af7e87/1606487146739/mongoose_mountain_bikes_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68955c60-3c0b-420a-a88e-c36279d52051/que_es_sensualidad_humana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98569bd-1980-49d7-9e2e-f3118a89aaa1/assurance_of_pardon_hope.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fec5e5c7695ca99c2451/t/5fc59eb19d793648404f323b/1606786739353/lokekozatiwivivajobap.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf65fe173fb5383b9a6eda/1606379006301/40142634955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5765023-43cc-4952-9c7b-02f9e8beb4a9/44382507907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff602dcc-608c-43a1-bc83-064f284b700c/87528891671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04cc89f-71ba-4a31-8c60-eb42542bf316/engineering_guide_bfa_8._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592f9b09-5d33-4a58-97a0-742718daadb6/98094544705.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_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 5068 bytes
SHA-256: 08760188d047e8a545fbe3d16c3b70181cad6956ddfeab1a633da325dc0370fa
font_01_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10920 bytes
SHA-256: 5415f80adf1edb362d079eb773c89b4665f620f10136a25b8a43e8e9360b6656

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