Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c70a2a5ba14aa52…

MALICIOUS

PDF

133.1 KB Created: 2021-04-03 23:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42518768bce29b413c62f4d518f49d21 SHA-1: 83ed2befa55d6c187270ab004919a662214481f5 SHA-256: 9c70a2a5ba14aa520da9b99f841ab0bdfa95d78c6f774ed6061f091833cedd65
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 0.9944

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://mezovuduw.ru/wix?keyword=running+man+2pm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476582/normal_601de645cd482.pdfIn PDF document text
    • https://cdn.sqhk.co/xizojotozodi/bStF0ji/fezilefizejeradenonot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_602eee517c218.pdfIn PDF document text
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/5068039.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/2rFsFjd/online_slots_usa_legal.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/bb76zgi/ships_of_battle_the_pacific_war_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481273/normal_6008997ede4bf.pdfIn PDF document text
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/afc261a02f06e.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/Hhiidhe/14408066257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_603d13335149b.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/TNijicj/wovapiduxiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/Od6geje/international_calls_on_whatsapp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420907/normal_6009070893717.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/hc9Thi5/vexing_synonyms_english.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/2M1Bpjg/kizinefalomatutudawefepit.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/g7G2ieS/mario_kart_tournament_may_2020.pdfIn PDF document text
    • https://madigapelodawip.weebly.com/uploads/1/3/4/8/134846312/07e9ee72784882.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/winazuxazad.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/hfWZifk/96718612520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujozigimak.rf.gd/bonosonotosafiluvitoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/kit_de_nettoyage_swiffer_wetjet_wood.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/luke_chapter_1_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/air_pollution_control_technology_fact_sheet.pdfIn PDF document text
    • http://tedipokexumo.epizy.com/rpg_maker_vx_ace_tileset_template.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/satamenotelosazoke.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001500b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500B 33680 bytes
SHA-256: 2826d377a5d9f861bc3629b98e33822d35a837f73290e4f51ba780da3e82073e
font_01_sfnt_off0001ad8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD8D 4972 bytes
SHA-256: 82152b57fb801c6f75f74b69d182c3b2633d38d19fddbffaa3ab4f4fab2b4e7f
font_02_sfnt_off0001be68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE68 2284 bytes
SHA-256: 9e1b5a22a4e812d8e40943107ae772de410627a1b530a5785d852530b9e163fb
font_03_sfnt_off0001c8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8A8 11748 bytes
SHA-256: 005faa60a0ba4b974366147d3737588fd26dcf459ebc47f341cebd55f91f050f
font_04_sfnt_off0001f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0F4 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2