Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d6dd9928a2c2a8…

MALICIOUS

PDF

82.1 KB Created: 2021-03-20 19:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f335dcd98e2510d83627741950a7e67 SHA-1: b757f3d6e2af6868899e674a93ba02ede6305fb8 SHA-256: 50d6dd9928a2c2a84049198ef5acdb6f07c783b096413e1bf7cbcaf4cc329d25
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, appears to be a lure related to technical specifications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/award?keyword=astm+a53+grade+b+schedule+40+pdf
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/jitusetevasadivixa.pdf
    • https://cdn.sqhk.co/xagaxubibiz/fhcr4ii/electric_live_wallpaper.pdf
    • https://static.s123-cdn-static.com/uploads/4461509/normal_5fccfe069dc7e.pdf
    • https://cdn.sqhk.co/bepesewutu/3icPOia/5370021099.pdf
    • https://cdn-cms.f-static.net/uploads/4366340/normal_60504c57115ef.pdf
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/5717490.pdf
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/kotidemuku-reral-xegemakagamo.pdf
    • https://cdn-cms.f-static.net/uploads/4387566/normal_603f4a486db8f.pdf
    • https://cdn-cms.f-static.net/uploads/4408323/normal_600c0061799e9.pdf
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/jowumomizonumolav.pdf
    • https://zokuvulasaxibu.weebly.com/uploads/1/3/5/2/135298812/566743.pdf
    • https://cdn-cms.f-static.net/uploads/4463277/normal_603fdc699bd00.pdf
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/niwemejoluwego_fazepalosuvu_welatazoledare.pdf
    • https://cdn.sqhk.co/malevevipali/pHhcjiq/3d_skull_atlas_app_store.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a3b08fd3-6403-4a71-b529-642759a73899/vodolawutijog.pdf
    • https://s3.amazonaws.com/jagux/popopufuluv.pdf
    • https://s3.amazonaws.com/paxuvagal/whats_a_good_name_for_a_lip_gloss_company.pdf
    • https://s3.amazonaws.com/lixasifasi/mountain_athlete_exercises.pdf
    • https://uploads.strikinglycdn.com/files/ddc2efc6-3851-480f-b423-4dd97e311d24/55953320696.pdf
    • https://s3.amazonaws.com/dubiditiginowo/as_bill_sees_it_free_download.pdf
    • https://uploads.strikinglycdn.com/files/be8c3c9e-28eb-411f-a7a5-ff03e5da6645/2733367367.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_off0000ff14.bin
4887e0042c3d0ed6851cc5d070a4c1cc45d839be8312b8161cba2072f7f1ba1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 6216 bytes
font_01_sfnt_off0001140c.bin
e199ae16df2e315c18089e2cea125f43f3fafa33c57a1a3f55d78bf7101f0ee9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 11620 bytes