Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd225ba97b4e8037…

MALICIOUS

PDF

81.2 KB Created: 2020-11-11 21:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d153c60aed149fba26bb8a7e6c030c51 SHA-1: e5ca95307bbaa62094545fa8f3e8f448a7813b7c SHA-256: cd225ba97b4e80370a2fcdc8d745fccc0382498303194d91e1a26d5de0552381
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or to distribute further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://trafficel.ru/aws?utm_term=transformers+fanfiction+prowl+sick PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8b5502f2ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5fa112b46a720.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/5e623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5f914f51c149d.pdfIn PDF document text
    • https://nobigifawu.weebly.com/uploads/1/3/4/3/134310244/lawupixumazuso_gasapobe_bujexajalilov.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/xazunanuraga.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/zegugumufite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f9590e94f5bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_5fa7404044808.pdfIn PDF document text
    • https://neziraninev.weebly.com/uploads/1/3/4/5/134502601/1757881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sasufufa/37327094880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a1d343-be2d-4b5b-bc94-b492aab9da98/59328656907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f69f6c-8f03-4bc9-b444-6b31cba7ce9d/xesupisadebivi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 4532 bytes
SHA-256: e064e377fc54c3562b0a643eb7dbe9b5bfc81cf07cd849d03f475af54447e900
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 5056 bytes
SHA-256: 8f0fa7be1c42ecec9d785e836e6db143707c0345279715da9f217f35cefbf3c4
font_02_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 10616 bytes
SHA-256: 2a8851f368fccf17abfe6db359fdaaac69159f23a82815ab8b64e313da3bcf30
font_03_sfnt_off00012933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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