Malicious PDF — malware analysis report

Static analysis result for SHA-256 699f0fb7d82d8ab0…

MALICIOUS

PDF

76.7 KB Created: 2021-03-09 01:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b81eada518412f9494dc3107ed8590ab SHA-1: 9e351468bc799b18fa00f73e8e354b9e5387a21f SHA-256: 699f0fb7d82d8ab03a03bf10c67c084b182ced604291817131939f733f88578c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://bologen.ru/wix?keyword=utility+bill+example+pdf', suggest a phishing or malware distribution attempt disguised as a utility bill. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=utility+bill+example+pdf PDF link annotation
    • http://circus.market/sopobigepugor63lw.pdfIn PDF document text
    • https://cdn.sqhk.co/tutogalubete/IxgcuB4/bass_editor_boost_bass_and_save_music.pdfIn PDF document text
    • http://efarbok.xyz/char_broil_tru_infrared_grill_igniterx5r7h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5fdbffc931c26.pdfIn PDF document text
    • http://banquepopulaire-fr.org/doctor_on_demand_applymnaqf.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/wimazorafibal.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/24961216568.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/is_tire_flipping_a_good_exercise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_601df38f269f2.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/hcpihhd/kumoviledukonosa.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/gRibhhn/destiny_child_mobile_game_tips.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/le_corbusier_five_points_of_architecture.pdfIn PDF document text
    • http://study-english-02.space/ximivajolurutofefizevuwgwqc.pdfIn PDF document text
    • http://mivetys.xyz/81361145580dumqx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_603247c86dc68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_603ab2b5f28d0.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/whbnUib/airport_controller_game.pdfIn PDF document text
    • http://zdsshop.top/jukupibaxedaxowimuvitor8hnud.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/e1Pjbif/dirt_bike_racing_game_unblocked.pdfIn PDF document text
    • http://cybety.xyz/rofekamusefaxul85kkj.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/bf8a8ab2-70ac-4b93-9fe8-5f6034fc5da8/how_much_does_a_25_hp_johnson_weigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772153a7-c337-4ea2-8a04-0bac88ea0ef9/63277288932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cb519d-4e5b-4032-bcbc-da97b8470144/19104090322.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/pumabipaduvipezikapituv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce74f1de-8bdc-4c9c-8225-07e45b994c80/simplifying_trigonometric_expressions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1baf723-606b-4d34-80f0-33698dbec1a4/2005_honda_odyssey_touring_run_flat_tires.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_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 5212 bytes
SHA-256: 5be6008934f5848459c898f2f1453bddac953a0a817cb694e15c174378192c78
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 9768 bytes
SHA-256: 6404bde83cbb79127d81fcc05ec343df28e14dbf82913d284c636c080f0401fc