Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa8a96af5fbafb8…

MALICIOUS

PDF

77.1 KB Created: 2021-04-18 17:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ee8a30017a958871b45a0cbb9b77f0c SHA-1: d325294d06dddac1ea73fecd5d4c9eeff3246c89 SHA-256: cfa8a96af5fbafb87f5b2e9085f771677b47c6d318c92ed41e5369466b8703cc
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 pointing to disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=stone+soup+read+aloud+by+jon+muth PDF link annotation
    • http://tesilav.sportsontheweb.net/iyonik_bileiklerin_adlandrlmas.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/ijhedL4/38055317555.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/gj29czE/rawevuxojolotije.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/eib4hcb/79562669713.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/PbgjjgX/runner_among_us_game_age_rating.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/iiY1icq/dominos_coupon_7._99.pdfIn PDF document text
    • http://xerijegodufiw.mypressonline.com/maharashtra_state_board_biology_textbook_class_12.pdfIn PDF document text
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/volozizemixixod_xudulogoxofur_xubanu_mubez.pdfIn PDF document text
    • http://lulizukudomiz.scienceontheweb.net/ussr_anthem_sheet_music.pdfIn PDF document text
    • https://vosaxivuminol.weebly.com/uploads/1/3/4/3/134387598/noxapibasisadoba.pdfIn PDF document text
    • https://fidagavatijib.weebly.com/uploads/1/3/1/3/131398583/ba8b88.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/LQjjzhj/halloween_town_series_imdb.pdfIn PDF document text
    • https://misiwutikamiba.weebly.com/uploads/1/3/4/6/134601431/3197407.pdfIn PDF document text
    • https://vusiwofadenu.weebly.com/uploads/1/3/4/2/134265349/b4a89f45.pdfIn PDF document text
    • https://cdn.sqhk.co/lujobitazeku/lihujfg/95030651264.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/gotijejaj/samewugonuwexajix.pdfIn PDF document text
    • http://suwuxuk.epizy.com/83682371563.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/cannot_twitter_from_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/nerojojodukiwepanotot.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/painting_canvas_shoes_angelus.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/cardiologia_guadalajara_booksmedicos.pdfIn PDF document text
    • http://pizodixevefok.rf.gd/multinational_advertising_noun.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/zupuve.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_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 5620 bytes
SHA-256: ef6f7598cde576a1687850337bbe565909995bc827eac7cdae6c62bbc16c6657
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 11192 bytes
SHA-256: 16ed18adb8966ab805ca2b35f2fe9b715a5257ea661bcc6931e0fcdced43adb7