Malicious PDF — malware analysis report

Static analysis result for SHA-256 f182b304818abf6a…

MALICIOUS

PDF

82.8 KB Created: 2021-03-07 00:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7d14b4f7c5c88da57d170c101f61ccb5 SHA-1: 9cc410d746ab1ca53f7a04b4687959720454e8d8 SHA-256: f182b304818abf6a7bdb700ec73eb756f87069b7b3010cdb0158244bdeeadcba
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves leveraging link farms to direct victims to compromised or malicious infrastructure.

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://dafemum.ru/123?utm_term=honeywell+quietset+5-speed+oscillating+tower+fan+white In 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://uploads.strikinglycdn.com/files/c57c0e3c-0fb3-4a18-87be-a995a37a8994/64571058014.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/free_sheet_music_fur_elise_full_version.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_d9a1946b3897479db3f40392e0fc29f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9308f0-c636-4692-8742-ca4777ab7928/is_a_muscular_body_attractive.pdfIn PDF document text
    • http://zewadajimenu.rf.gd/69037637868.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/zikofube.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_efcc6d9b1d484a48bd2f8b6796c760bf.pdf?index=trueIn PDF document text
    • http://nukivamo.myartsonline.com/gusutiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4bf1a40-7643-4645-beb1-7bbaba95d9ca/the_algorithm_design_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/20202068227.pdfIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_e66530f9b265487f9d9c583d414fe164.pdf?index=trueIn PDF document text
    • http://kivajujudupogij.epizy.com/42990269729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0117315e-3987-4d3f-a472-3fe09a41fdd9/63967343355.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/tibasemulipar.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/which_of_the_following_is_a_characteristic_of_a_plant_asset_such_as_building.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_cacabd33db1c4e8191f6732acb3edd91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cbd326-3fdf-4b78-92f0-c6a7d5f57f91/zabuzusonapil.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/lofariditadugugot.pdfIn PDF document text
    • http://lerakegubonigob.epizy.com/71398214505.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 5736 bytes
SHA-256: c027c9b37c048c5a90194820377545a1be436ba1e68868a8baffa77c72e0afbc
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 12632 bytes
SHA-256: 05de7fe668da4d19f2e74a312d709b035672ba2a19ceb499984dde524b5f4d33
font_02_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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