Malicious PDF — malware analysis report

Static analysis result for SHA-256 6927c9ea6e47af44…

MALICIOUS

PDF

62.9 KB Created: 2021-01-08 13:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6652bf5f0cc468bfdfff3e1bf971cb2d SHA-1: ebf27451c077cb31e94c17f05358716beee6b31e SHA-256: 6927c9ea6e47af448f5ed31d84ed0cca6ff0c043b3497e600c36385d19ec9290
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to spearphishing.

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://trafftec.ru/123?utm_term=rolling+ice+chest PDF link annotation
    • https://mirivibi.weebly.com/uploads/1/3/4/2/134234555/c9b310e.pdfIn PDF document text
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/4119170.pdfIn PDF document text
    • https://nowebapimigofok.weebly.com/uploads/1/3/4/3/134338607/2e5f5df41fd50c2.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/chcijh1/bubble_witch_saga_2_mod_apk_unlimited_everything.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/bLigsid/face_mask_required_poster.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/sivewisuvoliget_jabibaner.pdfIn PDF document text
    • https://wabuxopimigom.weebly.com/uploads/1/3/4/0/134042903/pekusuz_jeted_panuvidarup_bufaxiguso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cddef7fc-d9f1-40b1-9bf8-74068e87f63e/juwebanevebavegesadepika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147733c3-f7f3-4047-99c6-ca3c49ddbf91/64536925638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72435c3e-6cf7-4c4e-b4b3-6d2c543b10f3/juxepuzunesole.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/vobikizixawokejiwarefuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f165c6-b45e-4212-b2e6-58d57c1eac6f/all_destiny_2_emblems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3a92bc-fa42-4207-865d-effc8bd5eb69/24919080006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d04884-c58c-45e1-94a1-b81507c7a1f4/sew_a_bookmark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0658de6b-2ad4-4dbe-bbcd-f2da34c0f0fe/pokemon_lets_go_eevee_download_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90374954-59c9-4c1b-8299-9893178955b1/xumezimotuf.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_off0000b960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB960 4760 bytes
SHA-256: 64fba91d737a32dbbec574fd42e0bb4912d10a7a889935f97e2720b1c6057503
font_01_sfnt_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 10528 bytes
SHA-256: 7ac8f78fb79c25ffd427258fcf232b24be69492c4dc43ceec93b7863770afb61

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