Malicious PDF — malware analysis report

Static analysis result for SHA-256 72edc96868d913be…

MALICIOUS

PDF

90.9 KB Created: 2021-04-22 01:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a11bb8348b5e608e20e4e41417b49103 SHA-1: 211f6a8964d416371cb85840ae1f155c8f3a4d45 SHA-256: 72edc96868d913be51be0cae684414bf96efc0cc92c4801598222732712ace8b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it may be a generated PDF rather than a user-authored document, further supporting a programmatic malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=model+3+vs+model+s+interior+space PDF link annotation
    • http://zotoxilob.getenjoyment.net/30984401698.pdfIn PDF document text
    • http://niwopofe.scienceontheweb.net/49729567482.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/english_to_bengali_translation_dictionary_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/idjiuhh/96479434084.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/Zfsgeia/prop_hunt_game_code.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/jhhiROM/yu_gi_oh_duel_links_deck_building.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369138/normal_5fe59989623fc.pdfIn PDF document text
    • https://cdn.sqhk.co/borilokam/hjKhahj/oxford_english_learner_s_dictionary_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jhMFLjc/75061456565.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/hFgfiiU/niborapezivar.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/23394820828.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/alimentos_con_carbohidratos_complejos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476582/normal_5fc5dbb92638f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473384/normal_602d3feb23c10.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/HjcDicL/sage_the_gemini_latest_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/bRiheHw/secret_of_mana_remake_pc_trainer.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://uploads.strikinglycdn.com/files/65bf607d-0c4e-458b-b056-4ba0942975e8/diy_painting_kitchen_cabinets_without_sanding.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/7168254243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf058aa-5f86-492c-901c-fd14fc7b671d/65508601690.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/staples_mailmate_m3_shredder_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a9e7e4-5531-41fc-97a6-a7113197f668/wekokogavupomojuvu.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/minecraft_survival_island_seeds_pe_1.14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef2e1be-017b-4a48-82e8-7f256726e3d7/tamemekasafu.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_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 5236 bytes
SHA-256: 7115720baa926324767ddbcd93bbf25e106c8f9dacd75422fdb5396328378422
font_01_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 10464 bytes
SHA-256: 5a015d82bdc283b4cb2d5b95e2760e2b06805a46f20e22273913282aaf2b3e18
font_02_sfnt_off00014fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2