Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bceef383c2501f…

MALICIOUS

PDF

75.0 KB Created: 2021-04-15 03:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 74b72053c8da898f7d9eb933ed5d9f51 SHA-1: 2954240a588f8975f544ee8cbbfd3bff264b5371 SHA-256: d7bceef383c2501f34cd331806f12c028bae377e615247181282e5ef7b4463fb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the embedded URLs and the PDF structure itself are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=what+is+the+best+paint+by+number+app PDF link annotation
    • http://sovuxofi.66ghz.com/apple_iphone_ringtone_remix_free.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/wezowuxidunotademevefe.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/nagata.pdfIn PDF document text
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/zafivogo.pdfIn PDF document text
    • http://mesugowogidevik.iblogger.org/32623618272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_9a7b2334231c46e3bac49a6eb1e707fb.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_8dd4fa768c3f476aab8b8ba3d6346760.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_f3aa0f601746409481cfbe163df5d684.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_d8b898c8f7fe40de90ce6d9de267fd55.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_7db87a82ea354a099a8be40db7032705.pdf?index=trueIn PDF document text
    • http://kepirodineloga.epizy.com/fox_sports_1_america_tv_guide.pdfIn PDF document text
    • http://pukafenofi.epizy.com/notwithstanding_informal_synonym.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/nimegunuwarukoput.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_be38bff04c8046dd841f9439c7716e82.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_87eef38286c148c6b678d21028a74289.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_e320b97b47324d4eb3e74238ee8dec12.pdf?index=trueIn PDF document text
    • http://lizijor.rf.gd/documental_antes_de_que_sea_tarde.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 5284 bytes
SHA-256: 58666380d18bce1b7681b8af0a9f5aab613895227fbf23079a9778be08e56eeb
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 11276 bytes
SHA-256: d57623e335d8158d8ce9128cde1fabe4f2265898a7ec83051d2830989b47eb9b

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