Malicious PDF — malware analysis report

Static analysis result for SHA-256 1839f890f337d1d6…

MALICIOUS

PDF

74.7 KB Created: 2021-03-16 00:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8a9fc0839a05d0c287d8fad1c986a865 SHA-1: 6df254f48d7903d22944c052ad3f7bf2911cecd2 SHA-256: 1839f890f337d1d6af339ab281cb0190a407aaaedc96f4b3d6375172ebb4dd77
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies it as a link farm on disposable hosting, suggesting a tactic to obscure the true malicious destination.

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://jumiwimov.ru/123?utm_term=bmw+m3+2018+manual+transmission PDF link annotation
    • http://guparob.mywebcommunity.org/my_friend_dahmer_book_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/f9wkhfT/mapfre_asistencia_annual_report.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/html_link_to_download.pdfIn PDF document text
    • http://migriruy.ru/gillian_chung_alexa_chungneewq.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/gjiijlC/lenovo_premier_support_phone_number.pdfIn PDF document text
    • https://mogunugive.weebly.com/uploads/1/3/4/3/134381007/62b1b8b3b06.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/jbtpGjf/world_record_rap_speed_2020.pdfIn PDF document text
    • https://jizenovu.weebly.com/uploads/1/3/4/6/134682428/mupapifejurix.pdfIn PDF document text
    • https://zesujixiti.weebly.com/uploads/1/3/1/3/131398447/0201ad7522ac6.pdfIn PDF document text
    • https://semoligi.weebly.com/uploads/1/3/0/9/130969118/5572545.pdfIn PDF document text
    • http://luxshop21.site/51665785418yu39p.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/fasunibirin.pdfIn PDF document text
    • https://nuxabofubuwaxef.weebly.com/uploads/1/3/2/7/132740905/kobun.pdfIn PDF document text
    • http://stc-l.ru/vexivoruxubowa8no0z.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/20708676777.pdfIn PDF document text
    • http://punejew.mygamesonline.org/fedex_canada_tracking_customer_service.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/duzexefemosaxe/toyota_avalon_2014_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/key_terms_chemical_reactions_worksheet_answers.pdfIn PDF document text
    • http://gibidapasajug.atwebpages.com/72907353014.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/sizinunoxopobusole.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_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 5656 bytes
SHA-256: f6683525bbddb75eef8acc05aaceceac2600943bb7737dee4ad08d7fa8f30c27
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 11028 bytes
SHA-256: 9b1aefe2a49754e01846cf49b30d0b3d657d373e09de09ee3cebc5dcda2bc6ec

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