Malicious PDF — malware analysis report

Static analysis result for SHA-256 afaadb0d9591ab59…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 04:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a331cb11b7803c65999c011387ddc7f6 SHA-1: 524c20f3ce6cbc09bf5c349f42077387ce3361e6 SHA-256: afaadb0d9591ab59c65a3646c5d6f3243d2c569a22f0128edb562045031a257b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, with one heuristic specifically identifying a large link farm pointing to PDF documents. The embedded URLs suggest an attempt to redirect users to potentially malicious or spam-related content, likely for phishing or SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=trash+masher+manual+trash+compactor+trash+can
    • https://cdn-cms.f-static.net/uploads/4385012/normal_60446bbeb304e.pdf
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/3367601.pdf
    • https://lulaxifijugom.weebly.com/uploads/1/3/0/7/130776747/sexelosuditutojitu.pdf
    • https://nalafefig.weebly.com/uploads/1/3/1/3/131379301/ef2da5083.pdf
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/7b517495f40.pdf
    • https://cdn-cms.f-static.net/uploads/4478398/normal_603636f52b45e.pdf
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/6174941.pdf
    • https://voladivilutefuj.weebly.com/uploads/1/3/4/5/134500748/6344890.pdf
    • https://cdn-cms.f-static.net/uploads/4489045/normal_601436f925d19.pdf
    • https://cdn-cms.f-static.net/uploads/4375708/normal_60142d4061165.pdf
    • https://damatabawapu.weebly.com/uploads/1/3/1/3/131379320/vuzakone-wemaga-pisudupate-titarufaj.pdf
    • https://cdn-cms.f-static.net/uploads/4495059/normal_606011ad888db.pdf
    • https://cdn-cms.f-static.net/uploads/4368242/normal_6019f4a3bafc5.pdf
    • https://cdn-cms.f-static.net/uploads/4368501/normal_600e0adf854c9.pdf
    • https://duditoza.weebly.com/uploads/1/3/2/3/132302736/sorubukimozoniwaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dorigosij.epizy.com/how_to_pay_ez_pass_for_rental_car.pdf
    • https://uploads.strikinglycdn.com/files/7e96135f-292c-45b0-a1a3-39a47d286d01/xakoxipigudepab.pdf
    • https://uploads.strikinglycdn.com/files/d9d5b2af-145f-4308-af56-36b9f855178e/85739269938.pdf
    • http://rimaxuj.rf.gd/caller_tune_song_wapking.pdf
    • https://uploads.strikinglycdn.com/files/e79e5dcc-f80f-4dda-9688-1df70341a9c6/43069725302.pdf
    • https://uploads.strikinglycdn.com/files/61b21040-ee85-455a-8866-0581aa3be9c2/sony_vpl-hw40es_review.pdf
    • https://uploads.strikinglycdn.com/files/5ac8831d-bf8c-475a-8da1-87fa10255c68/diablo_3_barbarian_build_season_21.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f988.bin
2ceaa1d941f8a50784ec772561aad005a85eb211cae4f97e35d219ce44b6f819
pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 5124 bytes
font_01_sfnt_off00010ac5.bin
970455d94c780d0c49406b6c1910d8fcf28c2872e45257e544d265e9d484f641
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 10680 bytes