Malicious PDF — malware analysis report

Static analysis result for SHA-256 5118f1ec08e1b186…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 08:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8398eacf49c469c22bf562b10ced85f3 SHA-1: 5b62c77428f395ac1d52afeedee4b49d6ab56a13 SHA-256: 5118f1ec08e1b1869e1a742aaf9c6cdf83bb34e4f04816912de5fa2dcaf5aefb
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, suggesting a link farm or a mechanism to distribute further malicious content. The primary malicious URL identified is vilenefex.ru, which is likely part of the distribution or command and control infrastructure.

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=statistics+for+psychology+6th+edition+pdf
    • https://sonatovixafu.weebly.com/uploads/1/3/1/8/131871956/porex.pdf
    • https://cdn-cms.f-static.net/uploads/4489609/normal_60542e470a4bc.pdf
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5fce193819043.pdf
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/2483165.pdf
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/zisetuxokidu.pdf
    • https://ribebolavat.weebly.com/uploads/1/3/1/3/131398139/58be619de9eba5.pdf
    • https://static.s123-cdn-static.com/uploads/4406782/normal_60095ea0e3855.pdf
    • https://static.s123-cdn-static.com/uploads/4374374/normal_5ffe5a032e028.pdf
    • https://xibomuwupipufa.weebly.com/uploads/1/3/5/3/135389044/buxewezikewe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1d8f05ef-470a-4491-8280-7ffc988bcca8/xibutiwamuwufidu.pdf
    • https://uploads.strikinglycdn.com/files/6fd9e9bd-29a1-4e35-a628-3cf79c4f2fc6/best_ar_15_brass_catcher_flat_top.pdf
    • https://s3.amazonaws.com/gidibesuxi/rca_systemlink_3_tv_code_list.pdf
    • https://s3.amazonaws.com/remeranexe/81233166734.pdf
    • https://uploads.strikinglycdn.com/files/d3f794e2-422b-48cc-b55d-806209613fbe/68939945944.pdf
    • http://wefixewixe.rf.gd/jovafotutawopesedak.pdf
    • https://uploads.strikinglycdn.com/files/f6489959-d35a-47e8-8095-f47dd5c876fa/67596197423.pdf
    • https://uploads.strikinglycdn.com/files/37d0e789-6f3b-4f7e-b9b7-f6528c417c14/how_to_make_a_house_song_in_logic_pro_x.pdf
    • https://uploads.strikinglycdn.com/files/11ac08b4-3e3c-4847-806b-205bcdee53f5/disopote.pdf
    • https://s3.amazonaws.com/tuzamada/gemarirezam.pdf
    • http://rujifejoju.rf.gd/life_application_bible_the_living_bible_tyndale.pdf
    • https://s3.amazonaws.com/tomamujuf/xikatudof.pdf
    • https://uploads.strikinglycdn.com/files/2072ef50-37ad-4183-8176-bfd047721a21/patton_puh680_heater_recall.pdf
    • https://uploads.strikinglycdn.com/files/00ff8fb1-72bf-4162-9890-baffaad29ecc/terobinasanojebi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6a.bin
beae01d1a714ea20c9c2c6fe1dbb319fccf370dd31561fd72e37822d92a2d1c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 5564 bytes
font_01_sfnt_off0000fd4a.bin
1e8198fc6e6f324456e11a59ec880f15deeb4774f9b5de672c072fef7fbf0e7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 11312 bytes
font_02_sfnt_off00012397.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 4324 bytes