Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fc3c350d879d14…

MALICIOUS

PDF

72.2 KB Created: 2021-05-31 19:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d03fc9a3bbe02db55707a8610425b0ad SHA-1: efa93997307497d6af38902c2036bf6ef714abd2 SHA-256: d2fc3c350d879d1416c7aee8fc41593f0cc1d9f8a5bda0f7da28022bb63b442c
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URL points to a domain associated with phishing and link farming, suggesting the document's purpose is to redirect users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=encyclopedia+britannica+15th+edition In PDF document text
    • https://gimebupezepufo.weebly.com/uploads/1/3/4/5/134507041/71e5f50f30ca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_600c10f34cac3.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/e41b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_6048cc1766772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_6057015016fd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368953/normal_6007cd9bb1cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_605674db3a89d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451736/normal_5fc9f8d8e1625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_5fd6aa8a2daf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_60143416328ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_6051dd9b70308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fccd3cd9f5fe.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/94ae5041-bed9-46e2-8b82-ecc68fbe6fd6/78951759988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ecf783-cf43-4d9c-b4d2-20832e1158a7/fivozava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bc9e18-0a5e-4b74-8e05-371507d225bd/38599947869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0f30e2-8b97-43e2-a356-7195ab1fc5b0/busufazidozuwirefera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585574b2-5ef0-4dd3-a64f-5aafa736be18/how_to_get_channels_back_on_dish_network.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144413559/27295611233.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/what_lives_in_a_swamp_ecosystem.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411627/81675001342.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_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 5356 bytes
SHA-256: e4e07cb6309a40126c06a5d2a063915e6de67ba20cd2b4fb516b6224add7afa6
font_01_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 10788 bytes
SHA-256: 580e9b2083580c5c17d2c4798c3d732ae2d95bca6ec128b485b4679be8457210

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