Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ca055e06fab6e8…

MALICIOUS

PDF

77.2 KB Created: 2021-03-09 13:11:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2454540eefd719d6d8298c822320d3cb SHA-1: eaf22956f417e7bcf07fbe7866f5e6efb2229175 SHA-256: 95ca055e06fab6e85e3fcc455cf01546b47acfe22a284918ad842f7fac7ad596
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://lozipotod.ru/123?utm_term=escala+norton+ulceras+por+presion+pdf
    • http://wasegulom.mygamesonline.org/ratusawafesiwezurotilob.pdf
    • https://waboralitenir.weebly.com/uploads/1/3/4/5/134504299/segamuxawesod_vonivizigon_rufosidof.pdf
    • https://lupudeme.weebly.com/uploads/1/3/1/3/131378919/tuvunekolaw.pdf
    • https://gozuneputir.weebly.com/uploads/1/3/4/3/134345179/1690078.pdf
    • http://fiwazurenorin.iblogger.org/what_is_the_penal_policy.pdf
    • http://duvazejezirofid.22web.org/siloguroxajun.pdf
    • https://giderolimarova.weebly.com/uploads/1/3/4/0/134098849/faxugezisev.pdf
    • https://merusedezut.weebly.com/uploads/1/3/4/3/134361649/5715944.pdf
    • https://papobujiwirila.weebly.com/uploads/1/3/1/4/131453114/7009565.pdf
    • http://bebetadiruj.mywebcommunity.org/lijedibefufudezodezojo.pdf
    • https://bikizulotozenap.weebly.com/uploads/1/3/1/8/131860645/xuteraferotixe_filotumobokexos_ladulawobed_suzotipamex.pdf
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/sivutova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tomoveko.epizy.com/top_10_behavioral_interview_questions_and_answers.pdf
    • http://lusozeto.epizy.com/differential_calculus_by_das_and_mukherjee_51_edition_solution.pdf
    • https://uploads.strikinglycdn.com/files/ee420e74-9763-4b89-b065-1d79d07ed29a/gejogamosero.pdf
    • https://uploads.strikinglycdn.com/files/26e60055-67aa-4893-a5ef-3d18451c2bbe/nanobobabegibalugipebi.pdf
    • http://bopiguxa.atwebpages.com/xinje_plc_programming_manual.pdf
    • http://tuwojusedikemi.rf.gd/classic_wow_questing_guide_alliance.pdf
    • http://rovafitazilom.epizy.com/punctuating_dialogue_worksheet_middle_school.pdf
    • http://mowigefugitixa.epizy.com/piano_sheet_music_easy_free.pdf
    • http://lonozixugixapap.epizy.com/urinary_incontinence_treatment_guidelines.pdf
    • http://danebusuji.onlinewebshop.net/16042988741.pdf
    • https://uploads.strikinglycdn.com/files/959fe603-8ebf-4079-86e6-57f167a6ac59/canon_vixia_hf_r600_review.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_off0000ed3e.bin
cf5a78d6618d9399392d2b0b073b31fd846d912e7b56e86559deba7510ddc419		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 5108 bytes
font_01_sfnt_off0000feb0.bin
82135c11d9d6f84d9df5364c7ef10038a6a7b5e67364c7951d511f63ee6759c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 12232 bytes

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