Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b40190c240b5a5…

MALICIOUS

PDF

64.5 KB Created: 2020-12-13 23:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 33b8a0f7ac5f733004b388501c38d4b8 SHA-1: e7228574a8a70c131e8ab1eb3f45bf2ee01f90be SHA-256: 12b40190c240b5a587125d57f5365c8eacb0979340f25c0b37916a5630dce105
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://gettraff.ru/strik?utm_term=shaka+laka+boom+boom+sanju In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5fabc996ce1cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450513/normal_5fc8a797f0431.pdfIn PDF document text
    • https://dutigopomifit.weebly.com/uploads/1/3/4/6/134611267/geras.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/4cf842764.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/fudezudubedulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_5f945f21523a4.pdfIn PDF document text
    • https://nurifekuti.weebly.com/uploads/1/3/4/5/134516663/lutegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc68006ab79f442f250112e/t/5fc8bd468bd7793567586361/1606991174288/33165410109.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc292a4e5c7695ca9a65d9d/t/5fc378ebcb3e0f5771bcbad1/1606645997782/clackamas_web_academy_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76400be9-a7fb-420a-a8f0-bc3dc7bb0a74/31108775738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51cad5b-caa7-4d44-95b8-102dd3372920/maxurixazuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6de7bf-ea3b-44b9-80ac-8c9b7cbfe39d/it_was_a_pleasure_speaking_with_you.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/8257364418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa61aef7-7ec4-4d5c-b1f7-1c17177d0833/apb_reloaded_enforcer_guide.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_off0000bcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBE 5212 bytes
SHA-256: b947e9e1777f50627256b53c547a9efcc34a167362f8f14ade97b3bc5f07ee60
font_01_sfnt_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 11400 bytes
SHA-256: 1e3e1b16116ee20d1d7257bab403e431cc5b92a9552cd06cd21eb612c59a8250

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