Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcac2a3ea52a896…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 14:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42bcf6a97e95faf15ad7c664ed68cc75 SHA-1: c06ab12d7165c1242dd3dd21f20005a6daf49011 SHA-256: 2fcac2a3ea52a896a9d57089a472726ab665743e71226c3ccbb6dd68ae063637
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to a link farm, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, specifically identified as a phishing or trojan variant. The embedded URL and the heuristic 'PDF_SEO_LINK_FARM' point to the primary attack vector of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=curriculum+innovation+definition+pdf
    • https://cdn-cms.f-static.net/uploads/4422620/normal_5fd905163f8bd.pdf
    • https://cdn-cms.f-static.net/uploads/4387938/normal_6025402234edf.pdf
    • https://cdn-cms.f-static.net/uploads/4402000/normal_602effbe40d31.pdf
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ff48f43642a8.pdf
    • https://cdn-cms.f-static.net/uploads/4425237/normal_60246d0925aac.pdf
    • https://cdn-cms.f-static.net/uploads/4408596/normal_6055988bd8d69.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vebogotexaf/brotherhood_punjabi_song_status.pdf
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_87971f64166b4785b2948c43e6029d37.pdf?index=true
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_2024d9b545744f9d8ce47bfc5e3e1fda.pdf?index=true
    • https://s3.amazonaws.com/benuka/87478872921.pdf
    • https://s3.amazonaws.com/jokotaziweluge/59555946173.pdf
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_67abc09e865741ccbd1186fe21ebcc33.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_18bf6f8a54dd451e953c61f873c20de7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8092d5ac-661b-4616-b3b7-fbfc61c74c64/fuwopagijomozorufa.pdf
    • https://uploads.strikinglycdn.com/files/8e79632b-ec8d-4932-a816-1eb840da6c40/63383476367.pdf
    • https://uploads.strikinglycdn.com/files/161df33d-e14c-4afc-87aa-6456f64b2084/sims_3_macbook_cc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f342.bin
37c0f85d457b3f82fcb2ff0e01dc40e3952f4e9a0f102126ebe6f16f64c0eaec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 5088 bytes
font_01_sfnt_off00010481.bin
9e882c77d5d930aa42f8e467c0b8f062506b171fc1930ee3b726e484f41aa0c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10728 bytes