Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d89ce8f2dec2a9…

MALICIOUS

PDF

132.6 KB Created: 2021-03-06 22:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b873df82dd1517c543266a6eaf3d60de SHA-1: 529a5ab8e90526df431946e9593596799199d302 SHA-256: a2d89ce8f2dec2a929d308ff74eeab4b8513770fe6bc5e9cc0813937a5d2313a
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 0.9973

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://crophysi.ru/wix?keyword=bless+me+ultima+full+book+pdf PDF link annotation
    • http://carins.info/zecharia_sitchin_books_amazon9ejzm.pdfIn PDF document text
    • http://mastera-saydinga.ru/district_wise_population_maharashtra_census_2011yuq1p.pdfIn PDF document text
    • http://cardioactiveufficiale.site/pokijakeje5m64h.pdfIn PDF document text
    • http://legendnat.space/lisa_dent_curatorittg7.pdfIn PDF document text
    • http://neyroskakalka.site/chapter_4_integumentary_system_worksheet_answers2w2ux.pdfIn PDF document text
    • http://kipivejezijab.iblogger.org/zorezapulu.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/0006c8f483.pdfIn PDF document text
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/4007509.pdfIn PDF document text
    • http://yeswins.space/how_to_repair_a_whirlpool_water_softenerbk05j.pdfIn PDF document text
    • https://goporurozabi.weebly.com/uploads/1/3/0/8/130874573/3221457.pdfIn PDF document text
    • http://armada.technology/dezofanubofusakemogijfgu50.pdfIn PDF document text
    • http://doordash.link/gigabyte_z370_aorus_ultra_gaming_motc69m1.pdfIn PDF document text
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/wiwagibagusexapade.pdfIn PDF document text
    • http://torchland.xyz/wirugipbh48h.pdfIn PDF document text
    • http://healthytrands.com/what_natural_remedy_will_kills_toenail_fungusv68kr.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/jugalizap_gebelafijuf.pdfIn PDF document text
    • http://dreamingdeveloper.com/cisco_packet_tracer_commands_cheat_sheets8sec.pdfIn PDF document text
    • http://autobaff.xyz/rujepozetd75k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_513a0de37b2c4bc992e5cd3b6af838e8.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_ace235b868f7495cb4fa8b3d7204aa6d.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_5d457a352f204d34a87789a2e85cc480.pdf?index=trueIn PDF document text
    • http://biviroromu.rf.gd/comparing_two_sets_of_categorical_data.pdfIn PDF document text
    • http://sivelulowu.rf.gd/project_knowledge_transfer_template.pdfIn PDF document text
    • http://pedijuwugeta.rf.gd/74761211425.pdfIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_971cce21b9ac4a8b909c0f5952c49ca8.pdf?index=trueIn PDF document text
    • http://pulupalu.epizy.com/guwovadiposilosazuno.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_871fb1861d4246fabb67b4b02161fbe2.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_off0001ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE55 5344 bytes
SHA-256: a744971ab9f923380565b981e1f6043ca40719174da58adfd1fab0937cd55a63
font_01_sfnt_off0001e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E06F 10516 bytes
SHA-256: 1ff2215d543d2253171c36183488aa7bb71df1fe48e017bc98fecf311431a18b