Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cf472d8c4de884…

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 23:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e8e8a27e8f217605b822e1ed09e29f2 SHA-1: 96fcdd396e4a4624a54d542be2a55db510800161 SHA-256: 79cf472d8c4de884e5466ab7803194a973ba474bee49805ba1fddc6b2fdcf8a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/aws?utm_term=is+it+normal+to+not+feel+empathy PDF link annotation
    • http://bagesopabiwub.scienceontheweb.net/lumegigemuvupazadoxa.pdfIn PDF document text
    • http://vefijedos.22web.org/gowukagikav.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/carpal_tunnel_syndrome_journal.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/igMsgdf/sausage_flip_best_games.pdfIn PDF document text
    • https://cdn.sqhk.co/dewobube/jaghuji/scent_of_a_woman_drama_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jKihTWZ/download_game_draw_story_mod_apk.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/awg_mm2_table.pdfIn PDF document text
    • https://cdn.sqhk.co/lorakerasima/8FhfJih/thug_life_meme_music.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/58730405224.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/56881395784i5fno.pdfIn PDF document text
    • http://kowuterada.mygamesonline.org/domupabojojuli.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/fItgj61/xoxelolomosarab.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/dIjhjjj/25218802305.pdfIn PDF document text
    • http://mantenancie.com/the_magic_flute_song_by_mozart522mq.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/cifhhgF/dajada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevidubigozexa.rf.gd/sevasuwerukegogol.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/games_cooking_academy_3_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/letter_format_for_resignation_to_principal.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/exemption_deduction_worksheet.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_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 5180 bytes
SHA-256: 2d806f225a649a28ba7184fa1f172880885c4c1ce70a340fecd78795104463e8
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 11500 bytes
SHA-256: f421be88b047ffa615e1f83926c1f05837f56ced6252bedaee1732a23fa52d08

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