Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b806c7080c5781…

MALICIOUS

PDF

107.6 KB Created: 2021-02-26 04:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e6e6c8c3d8e7bce132861c6439de7e42 SHA-1: 3cc5fce2f6b0fdc7ea9089954a355a55dd260df9 SHA-256: 05b806c7080c5781130a399620917b559a19285d9de6b971b1c7632bd227da0b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The presence of numerous external URIs, many pointing to disposable hosting, further supports the phishing and link farm characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/wix?keyword=utah+symphony+2020+season PDF link annotation
    • https://cdn.sqhk.co/fudopalizew/fgdAdZI/puppy_dog_hd_images_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462681/normal_5ff7ea9280e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5fe8db390397d.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/how_do_i_change_the_belt_on_my_shark_navigator_vacuum.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/best_udemy_course_for_data_structures_and_algorithms_in_python.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/8664708668.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/descripcion_psicologica_de_los_personajes_cronica_de_una_muerte_anunciada.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/vergil_aeneid_latin_translation.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/how_much_does_a_car_mechanic_make_in_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5feaed888ccb9.pdfIn PDF document text
    • http://punejew.mygamesonline.org/scottish_snare_drum_rudiments.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_60197184026b3.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/hbMhjcc/apple_music_free_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/idKAlij/bike_game_download_free_online.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://rodedewezijore.atwebpages.com/sobutivaronofeni.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/snow_in_midsummer_plot.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/64755771104.pdfIn PDF document text
    • http://nupusadulawux.epizy.com/ccna_composite_or_icnd1_and_icnd2.pdfIn PDF document text
    • http://xawosote.epizy.com/dalusagul.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_off00015c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7D 5036 bytes
SHA-256: bfca0aa7473a8a71a1ea9d43ca4820df669aac1f0d2b520e5fbd3730cdde4dc8
font_01_sfnt_off00016d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D76 10952 bytes
SHA-256: f6aeb57557495046dd3ad6fabe688ff6d8644c189be4083f03e000deffc0087b
font_02_sfnt_off000192da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192DA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3