Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d77e6315d26e9c6…

MALICIOUS

PDF

72.3 KB Created: 2021-03-10 08:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ced1c206d98bc2464eb18d80007e5908 SHA-1: a3b4dad430deb6946d2ebb0d8fa18b86ababe132 SHA-256: 6d77e6315d26e9c619e47621b77da1ecd90b29965a0d797606bc3cdb689e2203
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The document body, though heavily obfuscated, contains text related to 'Char broil grill grates rusted' and references wkhtmltopdf, suggesting a lure to a website that may exploit this search term. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=char+broil+grill+grates+rusted PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393358/normal_6018818411eb0.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/25920448095.pdfIn PDF document text
    • https://cdn.sqhk.co/zozusexub/eVOibjf/19369312191.pdfIn PDF document text
    • http://jinunagavep.iblogger.org/luluve.pdfIn PDF document text
    • http://wavesubikuviv.iblogger.org/finance_for_dummies_ppt.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/genie_powermax_1500_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/hiigjg7/vuwojapaw.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/mini_dv_cassette_walmart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467926/normal_5fe534e38a49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_603dfa55efac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446497/normal_60006a9f88280.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/what_are_the_three_forest_biomes.pdfIn PDF document text
    • http://sadanojigoma.22web.org/punctuation_worksheets_for_class_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/tieQhg3/lekisovonewin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_600f73d092f1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/zowisofuxipivu.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/look_whos_back_back_again_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/viewmodel_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/why_is_my_apple_router_blinking_orange.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_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 5132 bytes
SHA-256: b917d8094a1aa5fb3d739a682f7da361de8154c9fa1f626c5fec4adaaacd5f08
font_01_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 10084 bytes
SHA-256: 2eb194f69362e623018458e87705153f7822d56219458bf7498867936333be22

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