Malicious PDF — malware analysis report

Static analysis result for SHA-256 764252b9a96030c8…

MALICIOUS

PDF

82.6 KB Created: 2021-04-10 04:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54bf54042b97d2cfcc64e679cd26b9e8 SHA-1: aec5ffa9336f28f1ee435e0576a9a4769391641e SHA-256: 764252b9a96030c8171948efa13c773d7db097cd58122811ea307b17b8a9ae6c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, characteristic of a link farm or phishing campaign, with the primary suspicious URL being https://vilenefex.ru/strik. The PDF structure and embedded links suggest it is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=dewalt+dwe7491rs+10-inch+jobsite+table+saw
    • https://cdn.sqhk.co/wofikubid/iUgeQhd/tifogetusomesoselezufa.pdf
    • https://cdn.sqhk.co/jisaside/giaa8hf/45623536536.pdf
    • https://cdn-cms.f-static.net/uploads/4482648/normal_5fe694e1e5f85.pdf
    • https://cdn.sqhk.co/rivogigaweb/2oghN9w/65970384817.pdf
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/mozuk.pdf
    • https://static.s123-cdn-static.com/uploads/4416322/normal_6003298dbb679.pdf
    • https://cdn-cms.f-static.net/uploads/4415935/normal_6052bbe99efd0.pdf
    • https://cdn.sqhk.co/dosakupu/Nt8KZig/stumble_upon_meaning_marathi.pdf
    • https://cdn.sqhk.co/surodamiz/6fCjahj/28895685045.pdf
    • https://cdn-cms.f-static.net/uploads/4482872/normal_6046628b8e38a.pdf
    • https://static.s123-cdn-static.com/uploads/4527042/normal_5ffddeaf458cc.pdf
    • https://popilezofale.weebly.com/uploads/1/3/1/1/131164236/3663873.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zesixefe/4180722878.pdf
    • https://s3.amazonaws.com/warapagefasovi/rizisiwo.pdf
    • https://uploads.strikinglycdn.com/files/bd395680-930a-448a-a8f1-2ffdf10d4e57/karcher_pressure_washer_problems_electric.pdf
    • https://uploads.strikinglycdn.com/files/cce35b60-22a9-4788-aee7-7b84f2427f4f/zudabivipefisojudu.pdf
    • https://uploads.strikinglycdn.com/files/f03fb38d-7db5-4509-8dc9-9c7c0b2b1de4/dejadalolanilibomiji.pdf
    • https://uploads.strikinglycdn.com/files/e88960bc-b689-4979-beb0-921469832829/black_and_decker_electric_string_trimmer_manual.pdf
    • https://uploads.strikinglycdn.com/files/3c7e4bc3-0a2e-4a61-a6bd-3b0e5f406b8d/clinical_data_management_jobs_in_cognizant_pune.pdf
    • https://uploads.strikinglycdn.com/files/844d7c63-01b8-4dd1-ac38-a17e6d0c0175/is_lestat_a_real_vampire.pdf
    • https://s3.amazonaws.com/borokegujuzero/95485644161.pdf
    • https://s3.amazonaws.com/juvetaso/37233557901.pdf
    • https://uploads.strikinglycdn.com/files/84be1229-bdd9-407f-bb0e-9706041295f0/campark_t86_trail_camera_setup.pdf
    • https://uploads.strikinglycdn.com/files/b88a9308-658f-4601-95c4-65232e66eb39/what_is_the_official_summer_sport_of_canada.pdf
    • https://uploads.strikinglycdn.com/files/b5d4b1f5-5b38-4a92-bae0-635bdd612d8a/90278431569.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_off00010374.bin
9e644faf4b2c9a4f93e675b82b1e5051e3fe19712e6c361f0d339cc3ec3b3044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 5884 bytes
font_01_sfnt_off000117a0.bin
013b7f2e135a77e83f61f4b6222b494781b74255dd3b30340c20d814688cec8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 11140 bytes

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