Malicious PDF — malware analysis report

Static analysis result for SHA-256 b945e6d83c9c829a…

MALICIOUS

PDF

78.2 KB Created: 2021-03-04 18:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 49434b23b68c31b080eabd49e5457b13 SHA-1: 9c7b93b3de84a939945904a42a4b70cd4d080dad SHA-256: b945e6d83c9c829abb39587f5540b69363c8b10f6b2489c19c4ed9e4e24cf95c
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The document body, though partially garbled, contains text related to iPhone voicemail issues, likely a lure. The primary malicious IOC is the URL https://druttle.ru/strik, which is likely used to host a phishing page or download further malware. The presence of embedded URLs and the link farm heuristic suggest an attempt to direct users to malicious content.

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://druttle.ru/strik?utm_term=why+won%2527t+my+voicemail+work+on+iphone+6s PDF link annotation
    • https://cdn.sqhk.co/levuzivanu/rgiyzie/cm_launcher_apk_2020.pdfIn PDF document text
    • https://pugerazetowed.weebly.com/uploads/1/3/4/3/134341851/piduxexexaxibaguz.pdfIn PDF document text
    • http://xizabif.22web.org/asus_zenfone_5q_android_8_update.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/a8e547246fc41c.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/how_to_identify_a_pimp.pdfIn PDF document text
    • https://mazaxijav.weebly.com/uploads/1/3/4/4/134488449/goradetakujama-ravev-tuxekupexefin-mudinajupese.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/chjheCi/3d_galaxy_neon_fidget_spinner_theme_song.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/84954731298.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/biwapapubizurovujobobinit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widifusi.myartsonline.com/lets_talk_in_english_conversation_16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb071e1-876f-4944-b35d-ef95a040bb85/ar-15_m16_lower_spring_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759d582d-03dc-4d5a-aa1f-f506e66625a5/94376078642.pdfIn PDF document text
    • http://lejaget.epizy.com/vanilla_wow_mage_aoe_farming_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b217d778-8e31-4390-b61d-731ac38d2c42/the_wire_semicircles_shown_in_the_figure_figure_1_have_radii_a_and_b.pdfIn PDF document text
    • http://vogepaxita.rf.gd/62688272374.pdfIn PDF document text
    • http://lozunina.epizy.com/45854743162.pdfIn PDF document text
    • http://wosunitiguzivef.epizy.com/42769219912.pdfIn PDF document text
    • http://kumoxamumusuxa.rf.gd/london_theatre_guide_tuesday_matinees.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/on_the_reproduction_of_capitalism_summary.pdfIn PDF document text
    • http://kikadof.epizy.com/genie_pro_88_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2ecf51-147b-4d0d-be7e-5b9a82c1dae2/96685933960.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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 5692 bytes
SHA-256: 7e729be595cc77ad0e43b457d2ab82c9e02b57de3744054ded986d4d03d8812a
font_01_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 10756 bytes
SHA-256: 75f90ab8625e1fd487c45f34cba25d38d6eb64470ae0c7a2ebfaa283e715a33f

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