Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfeba6e4b6a5581…

MALICIOUS

PDF

71.6 KB Created: 2021-03-03 22:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 274faf145ea4f81cc0598799d2113c10 SHA-1: 6d9518703e38b8ee9917c2e09ed3a82c7c8bad38 SHA-256: 4bfeba6e4b6a5581d2024311d7e8392d5da06a95399f5af9b4ade1bd75f951dd
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, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/award?keyword=how+to+light+a+comfort+glow+heater PDF link annotation
    • http://bekopomulasebi.getenjoyment.net/fenupeda.pdfIn PDF document text
    • https://dugubutufafug.weebly.com/uploads/1/3/0/7/130775350/nevijipifepabuf.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/jfihiat/sosarosakixufoje.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/liredososunabenomova.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/dojururalosegi-mupowawip.pdfIn PDF document text
    • https://cdn.sqhk.co/sujoxeti/jaLBhjj/tips_for_bitmoji_avatar_emoji_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/hjhHrQU/48091970865.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/6Zjewgj/pandemic_ebt_virginia_october_2020.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/gupisunoxajajulod.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/router_asus_rt-n12hp_wireless_n300_high_power.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/what_does_inheritance_mean_in_object-oriented_programming.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/how_to_connect_polk_psw10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujimosodaza.myartsonline.com/sex_and_the_city_2_cast_names.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/diablosport_intune_i1000_vehicle_list.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/nipikivugigagufu.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/marafipenatonu.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/ashampoo_uninstaller_8_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/angkor_wat_local_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/63602745561.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_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 5168 bytes
SHA-256: 13cb10a255eed0a9c9920b1e6246208ca2bf9fe9c7eb8770a50be52aff554201
font_01_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 10376 bytes
SHA-256: bd870cbd9ed759be50c39e6992dac19c3bd90c99d2860cd200eb7821868e0e45

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