Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f31b01b288f959f…

MALICIOUS

PDF

76.7 KB Created: 2021-05-13 15:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fe1d1f4c82a8610f5760bfa2247a9b0d SHA-1: ae526312930bf4f5eeb7c5e9fbddeaafb93a7602 SHA-256: 8f31b01b288f959f46736291f59eeed98d20a16f7650da98a1ca47f782d3f75f
186 Risk Score

Malware Insights

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

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 0.9956

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://ponafet.ru/wb?keyword=black%20and%20decker%20electric%20weed%20eater PDF link annotation
    • http://ponipekerewex.22web.org/tisapira.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/sub_zero_650_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/ciiggLG/luwesedizodurevaguv.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/e722f96104fff.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/xuzetude.pdfIn PDF document text
    • http://memujinirenupa.iblogger.org/woxalozuverilomadezu.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/personality_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/VXU4Eih/racing_bike_tires_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/ijTghDY/batman_the_dark_knight_movie_300mb.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/3c9fe5e903f.pdfIn PDF document text
    • https://fizabogozof.weebly.com/uploads/1/3/2/8/132815807/3811948.pdfIn PDF document text
    • http://vewefoma.getenjoyment.net/dopebikelapulagufakuvej.pdfIn PDF document text
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/1948603.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/Licgjgc/famous_soccer_player_dies_in_plane_crash.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/3982782.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/kazipedunuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_e67d0ac770cd4c27bae127e2bcbbe684.pdf?index=trueIn PDF document text
    • http://pamerugug.epizy.com/illegal_unreported_and_unregulated_fishing_enforcement_act.pdfIn PDF document text
    • http://pezamax.myartsonline.com/95576968028.pdfIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_4e59f066415e4a548e51181931e758d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/mini_gs_barrel_backs.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/command_prompt_free_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/wifirefizi.pdfIn PDF document text
    • http://rivejekab.epizy.com/cheat_sheet_tft_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/20081467436.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/sad_background_music_for_documentary_free.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_c59d49de17054fd0a6ec24d5b61dd901.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_395124d5c6d54bcfa817c649938bc9ca.pdf?index=trueIn 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_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 4960 bytes
SHA-256: 285c8bdc0f259082895c0914f08d8ee8a4a2b2dfec1ec3619199b63492c4a4b4
font_01_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 11192 bytes
SHA-256: 781423737459e9766e75d322818b57cccf5ab999ca65746593c732cedb743406