Malicious PDF — malware analysis report

Static analysis result for SHA-256 8711dd77385bec07…

MALICIOUS

PDF

73.4 KB Created: 2021-02-27 04:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6f4bb8220514f386a7d64df95c62e774 SHA-1: 19e5a4e44299fae2b19c7b50a8ecf35d0afdef77 SHA-256: 8711dd77385bec0798b99175fc26261be525764150e62c02edb4795fea3952b9
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to technical queries, aligning with phishing or malware distribution tactics.

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://gimoguvi.ru/strik?utm_term=how+to+connect+my+vizio+soundbar+to+my+samsung+tv PDF link annotation
    • http://sadinexiwa.mygamesonline.org/gerunds_participles_worksheets_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_6011b7b63ab82.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/cant_really_wait.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_600e45ca9ac15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470552/normal_5fc724e4978a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_601794a006e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_5fdb6f44b3df3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_602650b5d8675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_5fd982515c25b.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/63666853589.pdfIn PDF document text
    • http://wukifiduputafeb.22web.org/autosomal_dominant_form_of_retinitis_pigmentosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_603426a92131b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5ff6b43ab7766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwejozaz.epizy.com/architecture_audio_books_free.pdfIn PDF document text
    • http://dadodoserosif.epizy.com/kejutuxawavesumunewuz.pdfIn PDF document text
    • http://lumawasisoxo.rf.gd/autohotkey_vs_autoit_performance.pdfIn PDF document text
    • http://vulikoviluxugu.rf.gd/autocad_lt_2015_offline_help.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/bls_guidelines_2018_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/how_old_is_emery_from_fresh_off_the_boat.pdfIn PDF document text
    • http://gukupexokopiwug.epizy.com/cambridge_a_level_physics_practical_guide.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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 5632 bytes
SHA-256: b5fc25ab97e9f8e355079bb3c7e4a6744566ff06cf1680a608932f58b10b6bde
font_01_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 10548 bytes
SHA-256: 98ff59788e01533938dd02bc7af247b1d62ad5c61b69243f1ac2d78cd42654a3

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