Malicious PDF — malware analysis report

Static analysis result for SHA-256 911785826946c021…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 19:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: edd5f9e9da2fc3cf89f445545b262e98 SHA-1: c0595628b2da18918a7a50c550b217bf95f93123 SHA-256: 911785826946c021d4320da7836256b5e6545bfe643a83acc321375226acff57
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to 'zajinet.ru/award', suggesting a lure to a malicious website. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated programmatically to appear as a research document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/award?keyword=english+language+proficiency+research+pdf PDF link annotation
    • http://iwhite.space/noche_de_amor_mary_balogh_gratis5wj88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392457/normal_5ff560f659724.pdfIn PDF document text
    • http://sparzha.club/super_sniper_efi_kithjx9m.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/kuwined-bukag-nanogoxod.pdfIn PDF document text
    • http://svarka-aurora.online/kipunemomif3jtl5.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/tactics_by_gregory_koukl_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5feb32206efdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_5fd73e4c9813f.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/hejcghu/old_vegas_slot_machines.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/6744709839.pdfIn PDF document text
    • http://gewusoluxul.scienceontheweb.net/jefuluselakofepoxolusuke.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/tsXgjid/22022715442.pdfIn PDF document text
    • http://kemutedetabu.scienceontheweb.net/bilunaxedija.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/ieUgefE/spring_boot_batch_command_line_job_runner_example.pdfIn PDF document text
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/1287506.pdfIn PDF document text
    • http://betmoy57.com/201543449968eufv.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/43109282366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fe99b2cad601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_60217162c2cda.pdfIn PDF document text
    • https://cdn.sqhk.co/tozijizubu/LggTwA4/the_walking_dead_season_10_midseason_premiere_date.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
    • http://wemaxoseni.myartsonline.com/cellist_of_sarajevo_full.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/how_do_you_descale_your_keurig_coffee_maker.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_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 5276 bytes
SHA-256: 8b24307c243671265d36e6eded97170ac588ab7728ab324a067994afe0f02ed3
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 11424 bytes
SHA-256: ad57e93b55f661cb5119090d7ac96945159c6f27fbdeeeb27d51155ecbc0146e
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2