Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b05826f3c086057…

MALICIOUS

PDF

73.3 KB Created: 2021-03-25 06:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 906b1a75e2beca08e1be9752d379548d SHA-1: d50b9e75ca1612c9433cf3e0524c9da28f2702d4 SHA-256: 8b05826f3c08605742cdeadca839d7663cc15168c8f9f49a0e586ba87c41aec7
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('dugedepap.ru') and employing UTM parameters, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=kinobody+diet+example
    • https://cdn.sqhk.co/tovipovo/0icLOjh/kafatonevojixobudagesa.pdf
    • http://xudogiborijum.66ghz.com/nexoxomekevitudeluro.pdf
    • https://cdn.sqhk.co/kaxonavi/8QieAsy/21604584757.pdf
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/9729469.pdf
    • https://lebiwuzi.weebly.com/uploads/1/3/4/7/134712266/sawafolibipatowasus.pdf
    • http://xobukafa.iblogger.org/fatexopevagexisezavo.pdf
    • http://lonuromaz.iblogger.org/weather_report_bopal_ahmedabad_gujarat.pdf
    • https://wajupera.weebly.com/uploads/1/3/4/7/134763514/nejulale.pdf
    • http://zumasuxujole.22web.org/30537950979.pdf
    • http://ramajur.22web.org/nerux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dowupozor.epizy.com/44003097890.pdf
    • http://mobisojew.epizy.com/android_9_galaxy_s8_verizon.pdf
    • http://jokipuzovorije.epizy.com/gipoxozuvatadumufo.pdf
    • http://palalujopaxuv.epizy.com/42632409750.pdf
    • http://dapukagizepor.rf.gd/97941287264.pdf
    • http://turixupifebut.epizy.com/bmct_terminal_berthing_report.pdf
    • http://bujewotaf.rf.gd/57196331150.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_off0000e3d6.bin
5968f15b3587e227ad781e8418b29530d4ff672d6440803dd465fd6f16bdea48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 5112 bytes
font_01_sfnt_off0000f538.bin
f590ffec732335364d609e93589ad7c2d5dda8b49e67ea73de976c6f6219c211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 10340 bytes

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