Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ec2f954783da02…

MALICIOUS

PDF

83.1 KB Created: 2021-03-11 22:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 260f53ab92759a20b08d92cc0ab341fb SHA-1: 800de317fef81dd01b7439c3111822088bc38aa3 SHA-256: 95ec2f954783da0236c640d5e13549e008dc47e7b926f310a12f9606f18e17b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF structure suggest the document is intended to redirect users to potentially malicious websites, such as the one found at vilenefex.ru, likely as part of a phishing or malware distribution campaign.

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-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/123?utm_term=batch+manufacturing+record+in+pharmaceutical+industry+pdf
    • http://preplafond.xyz/high_performance_liquid_chromatography_principle_ppt63rfe.pdf
    • http://cashthe.ru/27463423832dclur.pdf
    • https://cdn-cms.f-static.net/uploads/4409610/normal_60391e4892513.pdf
    • http://particulier-societegenerale.xyz/327679244495uakc.pdf
    • http://vigastlens.xyz/enders_shadow_series_box_seteftmo.pdf
    • https://cdn-cms.f-static.net/uploads/4414173/normal_600b39b3b9258.pdf
    • https://cdn-cms.f-static.net/uploads/4368481/normal_6037fcd7c3075.pdf
    • http://alluniversity.fun/us_election_liveadwz7.pdf
    • https://static.s123-cdn-static.com/uploads/4447465/normal_5ffdcfa62a6d1.pdf
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5fe924dd17c9f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wogikokuzotaxa/thng_t_24_2017_btnmt.pdf
    • https://uploads.strikinglycdn.com/files/657b8a3f-83ea-4ebe-8db2-87268f6b08cd/home_comfort_wood_cook_stove_parts.pdf
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_777ac9ed23e24783aa8cde03de13f82a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/595eb972-ac6c-4b6b-93e5-5ba3c9c5d39a/zenufudojolazewewijuzabim.pdf
    • https://uploads.strikinglycdn.com/files/7c4baa10-117d-493d-9fec-3adc03733594/idiom_worksheet_answers.pdf
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_724ccda5afd7478b9a2f39d5dc79e901.pdf?index=true
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_533e0ff9fdf247d39e3787a3b8cb2fe4.pdf?index=true
    • https://s3.amazonaws.com/gajabedafot/how_much_do_navy_seals_make_an_hour.pdf
    • https://s3.amazonaws.com/mojivikapeti/94600410068.pdf
    • https://uploads.strikinglycdn.com/files/2fc31ef3-01f3-499f-a39f-817d3ff1d8ab/5903926810.pdf
    • https://uploads.strikinglycdn.com/files/4f7484f2-2ab2-4814-a60d-7571f71876d3/download_walmart_grocery_app_for_iphone.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_off0001043a.bin
488747d0f5c1ef88d3a674d69e86077eca87909506c263156116289056d0ed23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 5720 bytes
font_01_sfnt_off0001178e.bin
9023ee33fd0a53dfebd2e735e22583e38aa871c34a0cfcbbe5ed624b8b0815ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 11820 bytes

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