Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3da6e6d60d9532…

MALICIOUS

PDF

66.9 KB Created: 2020-11-20 13:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 015373591a5a804a8df39384daf0f85f SHA-1: dcc7d5960d0b6206151f56565cc9d4202cafa446 SHA-256: cb3da6e6d60d95323a54c44e41f060c8eb614ff075a01c02b2fb7d007cf2358a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffset.ru/123?utm_term=stateless+nation+definition+ap+human+geography PDF link annotation
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/jivon.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/fa7400d3.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/xemorupol_dudeses.pdfIn PDF document text
    • https://jomixemaletid.weebly.com/uploads/1/3/4/6/134659672/buximadaveb_zusijowibo_nukozigopajazi.pdfIn PDF document text
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/rujaxezenudowi-roxeni-wovupipaxit.pdfIn PDF document text
    • https://denibizokitig.weebly.com/uploads/1/3/4/3/134340328/4515284.pdfIn PDF document text
    • https://movuvoxuwonorad.weebly.com/uploads/1/3/4/6/134667433/ninuge.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/wutiwobozuwe.pdfIn PDF document text
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/kenopiwomed.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/mijedusovineti/bikexib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ed017a-61c7-46cb-b4eb-3349f4400050/53740524576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8a3da9-e93c-40c8-b642-79fd904c34f0/fidowikofetem.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/tobowomixujip.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_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 5660 bytes
SHA-256: e067f192d84536543bce4c1c6dced733ab2b461fe0c1e9044c8dfba1ec2a6d85
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 9880 bytes
SHA-256: 51ebea76d3bb5f62d027d251efc5219bc09dba07d859eb630d40a4acc51bbf64

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