Malicious PDF — malware analysis report

Static analysis result for SHA-256 875b8392b73875e3…

MALICIOUS

PDF

85.7 KB Created: 2021-02-16 13:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8df1e222be7601247970608ba4da6863 SHA-1: 729c15100751f9e2d21315c3a29fe8bacabd1604 SHA-256: 875b8392b73875e3bcd25e949dac8cec13e713717d55962f80676a4affd1b1a1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting and potentially malicious content. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/123?utm_term=what+makes+distributed+computing+powerful PDF link annotation
    • https://vasaradafivoza.weebly.com/uploads/1/3/6/0/136048391/kamorewo_vixilegedap.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/OjixhbZ/masha_and_the_bear_games_for_free.pdfIn PDF document text
    • http://igcopyrightverify.com/vision_ias_ancient_and_medieval_history_notesgms5d.pdfIn PDF document text
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/gubogupobi.pdfIn PDF document text
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/bb38fb3.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/gdQgf2w/36596995258.pdfIn PDF document text
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/rorop_gezese.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/Tdibuig/dogixugikoni.pdfIn PDF document text
    • http://rollernefritmassage.xyz/super_starfish_all_fish_20198hw51.pdfIn PDF document text
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/movezanig.pdfIn PDF document text
    • https://cdn.sqhk.co/bogebumemilo/R2nRqcN/become_president_gta_5.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/hgi9Bgc/71021907455.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/cjeQ1CV/world_war_z_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/jirWkij/outbreak_prime_quest_steps_destiny_1.pdfIn PDF document text
    • http://islandlandscapesbb.com/enerpac_tool_group_actuantutvcm.pdfIn PDF document text
    • http://milky-rp.space/marriage_morals_in_islam89neu.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/8669769.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/gdxgfW5/final_fantasy_3_map_narshe.pdfIn PDF document text
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/1008595.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/gegchhS/fidget_spinner_product_life_cycle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dobikasukavu/nolewibavazipewanada.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/ardaas_full_movie_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/presentation_software_windows_7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 5760 bytes
SHA-256: 304ed68aad859d7ab7b92a3fac08a6567bbc393891c418800a5d9d60e412a271
font_01_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 10724 bytes
SHA-256: 2f5fd082be9807ce10da184e7ab45c7a0a026a4800b3180bb3c62162434703cf
font_02_sfnt_off00013abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2