Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac89d4135295cf34…

MALICIOUS

PDF

70.7 KB Created: 2021-05-29 00:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f2b2a9d7f38b282c2b4feede2b3d048 SHA-1: 7a7350ba3afcacc552ac820fa5dcbfa3e45d8ffa SHA-256: ac89d4135295cf34a7825044031a2df3741ebe5f6d584e37b29727e77d8267db
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent external URI points to 'https://maypoin.ru/123?utm_term=after+effects+cs6++mega', suggesting a lure related to software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=after+effects+cs6++mega
    • https://cdn-cms.f-static.net/uploads/4486534/normal_602a218716501.pdf
    • https://fogufapepupol.weebly.com/uploads/1/3/1/8/131871477/xafategurulevin_mazajizowuro_sefomabow_nujobavajema.pdf
    • https://sofowalomutupal.weebly.com/uploads/1/3/4/3/134310420/sizegow_momeroxugupup.pdf
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5ff6097edbf51.pdf
    • https://cdn-cms.f-static.net/uploads/4420238/normal_605cb6c4472ce.pdf
    • https://nekekijubexofus.weebly.com/uploads/1/3/4/5/134587401/3e178912f0a7.pdf
    • https://cdn-cms.f-static.net/uploads/4467019/normal_604d339a15a8d.pdf
    • https://gijepunudadolow.weebly.com/uploads/1/3/4/4/134497403/dexuboki.pdf
    • https://zugexegepu.weebly.com/uploads/1/3/4/7/134740595/betafosid-paluraruvoja-xofaxozafa-rusunibikigi.pdf
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/5963108c0.pdf
    • https://cdn-cms.f-static.net/uploads/4375704/normal_602932654a72e.pdf
    • https://cdn-cms.f-static.net/uploads/4391024/normal_603b5a64c02c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc5f0c50-b954-4778-9258-26e780effaf7/what_is_the_coolest_mythical_creature.pdf
    • https://uploads.strikinglycdn.com/files/9c563781-b5e3-4e11-ba44-03e304bf7783/16052053142.pdf
    • https://uploads.strikinglycdn.com/files/c5892981-21ab-4c51-9ea9-2a496c71685f/what_is_the_average_price_of_a_miniature_dachshund.pdf
    • https://uploads.strikinglycdn.com/files/2ac31bcd-85fc-4476-9624-01305be86bd9/79456587774.pdf
    • https://uploads.strikinglycdn.com/files/fb58a665-99af-4369-b406-4720626669b8/20515969168.pdf
    • https://uploads.strikinglycdn.com/files/2486b932-2d5e-441e-bd0e-646154c6e210/chrysanth_cheque_writer_crack_download.pdf
    • https://uploads.strikinglycdn.com/files/cf492eba-db80-4198-9349-de9bad68e8d0/63098358081.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_off0000d3b7.bin
6855f8356beab938006fc1f9a791bdaa13ede99bf5a3270bc578eb5cb40e2b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 5312 bytes
font_01_sfnt_off0000e5bb.bin
f3fa38b83e6fb5008d0761cf02b21b9134bfa7b90ed6d43a0c8e46a11d78a139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 12564 bytes

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