Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e8669e477cd5c7…

MALICIOUS

PDF

83.6 KB Created: 2021-03-28 21:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 84880232d3dbe5ae2caa2664caadf280 SHA-1: 6659b568dba2ba51e38e3d68f8d487e3e4302d0a SHA-256: 71e8669e477cd5c7f923ff556f7be65fec9042c6b1ad208268a87ae58b28f9ae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/strik?utm_term=onkyo+tx-sr606+hdmi+no+signal PDF link annotation
    • http://zekifafeter.scienceontheweb.net/types_of_blood_groups.pdfIn PDF document text
    • http://trikotoria.ru/devosamilevusivokav8fic.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/3623703117.pdfIn PDF document text
    • http://kulinar2020.site/rerebozasidebilag1hf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369793/normal_5fee9fab9e95f.pdfIn PDF document text
    • http://barberking.best/40034720989vczoh.pdfIn PDF document text
    • http://g2am2e.xyz/707909799776w7ny.pdfIn PDF document text
    • http://pmaider.com/dozowutudikabvnwjz.pdfIn PDF document text
    • http://good-production17.site/4468916868hfkz2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_602cf6f922725.pdfIn PDF document text
    • http://fitdieta.com/78084846998arur4.pdfIn PDF document text
    • http://uscreditinquiry.info/dates_of_the_great_depressiondoexs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_601cfdd1444b0.pdfIn PDF document text
    • http://unonatur.space/understanding_options_second_editionigfjz.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/regumamolo.pdfIn PDF document text
    • http://lorenbayi.com/xibobivodaveputith67l.pdfIn PDF document text
    • http://nubolutlion.xyz/98526923797ub039.pdfIn PDF document text
    • http://torchqbfl.fun/why_is_my_water_dispenser_leaking6inji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/mercury_smartcraft_sc1000_monitor_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/12959553028.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/89169090035.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/computer_knowledge_questions_and_answers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/pandora_er_music_file_location.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_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 5828 bytes
SHA-256: 6a9e4652f7d7cb16babbede6eba88cc7dca9ec3e10035251188ff362a1fb8237
font_01_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 11300 bytes
SHA-256: fbe6727a1b24e4b9de02027a769f7523e6498c6e4c078b7ef2ff8571873e9148

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