Malicious PDF — malware analysis report

Static analysis result for SHA-256 25618031132a7c94…

MALICIOUS

PDF

78.8 KB Created: 2021-03-04 16:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 222dfdabdcfe7b2f00ac010f388b14fb SHA-1: 8f6d44a178e02ce269734ea30893f519d0eb544a SHA-256: 25618031132a7c94aefdbafd8fdae24704f0275e2e15fc51be63a895868588b0
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to home appliance repair or settings, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kuzutuzo.ru/strik?utm_term=how+to+set+thermostat+for+central+heating PDF link annotation
    • http://vowufijetapiko.sportsontheweb.net/how_to_fix_kenmore_elite_dishwasher_not_draining.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_603d7ea80bea9.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/gijelexujewo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423453/normal_5fdf35049962b.pdfIn PDF document text
    • https://maraliva.weebly.com/uploads/1/3/2/7/132712127/f78a48b8183bef9.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/foxit_reader_print_multiples.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/vamupafum.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/what_is_the_verse_train_up_a_child.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/4805998.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/breathing_techniques_for_gymnastics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496810/normal_5fe4eba25f608.pdfIn PDF document text
    • https://gepufefodu.weebly.com/uploads/1/3/4/0/134013389/8196227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422385/normal_5fcb240803fbf.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/268ef4c155.pdfIn PDF document text
    • https://poxusesemeli.weebly.com/uploads/1/3/4/4/134462398/menezare.pdfIn PDF document text
    • https://piramejujidizek.weebly.com/uploads/1/3/4/6/134694247/f92c310aa5698.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/dikamemob_jefufirosudo_movida_veveko.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/talumefesufadoxopedi.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/9135800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65d6db9-a3f6-44cd-b3f9-788feb181908/why_my_rice_cooker_is_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc8dc6c-391a-4ce0-8f9e-f3e875d7eead/apple_ipod_shuffle_4._generation_2gb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135c16ad-cc5a-4c03-81e1-cb43945f2e93/xujer.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/30663448089.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/wusozewiferozetiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e1e833-049a-4656-a9e1-9d2123420b1a/tuvoropigu.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/how_to_keyword_search_on_ipad.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/bopafuwokatozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc92ee23-39d1-43a8-936b-78a5436508e8/time_management_techniques_for_employees_ppt.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 5348 bytes
SHA-256: f9d481a9df862e272834aa5b5a3f0c659d84e47908cd164173c66ca762563955
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 11024 bytes
SHA-256: 946b33073204338fc642215311f61ac8dd72bd1c812b8462497c69702892d703