Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d4ee547887ec88…

MALICIOUS

PDF

76.8 KB Created: 2021-03-14 08:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ce44f03a86cf9445f4dd2ea74e633bea SHA-1: 527d79238325dda882e9973d3764cb96d3db1d4e SHA-256: 64d4ee547887ec88b4504c951b78949a35cc12fb393e62c6bcaeb538dc6654fc
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one that appears to be a phishing lure related to appliance repair. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a phishing document or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=is+it+worth+repairing+a+washing+machine PDF link annotation
    • http://wasegulom.mygamesonline.org/wezok.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ZF8gcKd/xivikewawiluxotafivuzed.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/ni1TPid/asteroid_impact_simulation_video.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/jfme66w/3327787498.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/TjcRahj/4_pics_1_word_game_online_free_play.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/v_shred_diet_plan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415934/normal_5ffb14b00628b.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/eicHFhe/15452654953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420617/normal_6027b4621631a.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezima/5hiU4IL/tikigujowusapu.pdfIn PDF document text
    • https://cdn.sqhk.co/zuretagugaf/cbidcji/sc_st_atrocities_act_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/gdgjhie/personal_introduction_interview_question_and_answer.pdfIn PDF document text
    • http://dinewegivogofe.mygamesonline.org/11637920196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_601b4d06f37c5.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/wufujudisu/thailand_visa_on_arrival_application_form_india.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/you_can_heal_your_life_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b037191b-eaa6-4ca7-8f8c-1983348f7788/17681732017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d962ee-3b14-4233-bc7d-adf7d40e3f1e/unity_download_assets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8046b8c1-659e-4b31-aafb-9354b79ff4b5/sezezem.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/39159539062.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/navawaxuxisapuvikoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c1d28e-3bd0-4514-b47a-7d44fb9c064b/chamberlain_garage_door_opener_remote_programming_953cb.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/13981468217.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_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 5344 bytes
SHA-256: fffd849aded75a1326ab97d919768b94a69198ca36873ce82bf1f737f75dcfb0
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 11024 bytes
SHA-256: 94e5a8fa970de63bfd290a0532dc1f19dea78ffe6912cd53f54b19e862bbd426

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