Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b217412c66f093a…

MALICIOUS

PDF

91.1 KB Created: 2021-04-09 22:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41aad2c6ee9682fba7b65e08b67e7111 SHA-1: dc1590c42f5101c8fed42eb2369bff85353aeb00 SHA-256: 0b217412c66f093a77245d0f9f363d59f57814a00438387c910df2f16f3d437d
126 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 numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('midufefew.ru') that is likely used to host a malicious payload or redirect to a phishing site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=the+minister%2527s+black+veil+discussion+questions PDF link annotation
    • http://jezesotuvi.22web.org/sosek.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/7832996.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/zudalosogiwadalexufigidit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490738/normal_604d2fc9d50c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_606c94b443c4a.pdfIn PDF document text
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/4f4467bd.pdfIn PDF document text
    • http://rapalafipotofuw.iblogger.org/77979215977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_6058f6be0c1fa.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/kuwaribilab.pdfIn PDF document text
    • https://risimomumet.weebly.com/uploads/1/3/0/8/130814588/950805.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/13ac4b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_600fcb5b5b78d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468536/normal_5fcf1267ce738.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/connect_bluetooth_headphones_to_xbox_one_wireless_controller.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379221/normal_5fca5a9e7ecf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mubenud.rf.gd/arap_bahar_nedenleri.pdfIn PDF document text
    • http://xejawaji.myartsonline.com/40227985995.pdfIn PDF document text
    • http://kizilobizewepog.epizy.com/computer_hardware_basics_and_software_installation.pdfIn PDF document text
    • http://xevupan.rf.gd/danafatexibabafidobusobib.pdfIn PDF document text
    • http://figavexujofivu.rf.gd/create_tracing_name_worksheets.pdfIn PDF document text
    • http://lugegomafu.epizy.com/wilinisali.pdfIn PDF document text
    • http://xalatirasu.rf.gd/49658623601.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/bikaru.pdfIn PDF document text
    • http://lapafat.rf.gd/28_day_banting_diet_plan.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 5436 bytes
SHA-256: fa0c0157e3bbbc430064bc5ff2b9f15e648e844e4e1770a93825bdb725259efb
font_01_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 11280 bytes
SHA-256: d5e8a1b17d08f6a7b80b4276ebf5438cac98c00d307c8d19e262388ba29eb9f7
font_02_sfnt_off0001507b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3