Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b56bc5eaad0bc6…

MALICIOUS

PDF

71.8 KB Created: 2021-02-25 20:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0ae63fe6f6fabd2447cb2560fc9e422f SHA-1: de012eaee2a9471ef33344e102c0c54da5dbea87 SHA-256: 19b56bc5eaad0bc6e08474dd26b3f825582ddca642a92e40e26b2646bb8f24fb
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains numerous external URIs, with one prominent URL, 'https://baarspo.ru/strik?utm_term=hoover+floormate+spinscrub+filter', identified as a potential phishing or malware distribution point. The PDF structure and embedded content suggest it is designed to deceive users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=hoover+floormate+spinscrub+filter PDF link annotation
    • http://flylovel.com/hp_probook_4530s_cmos_battery_replacementvc9u4.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/eALhjeo/slither._io_2_online.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/how_much_is_a_polaroid_sx_70_land_camera_worth.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/the_7_laws_of_spiritual_success.pdfIn PDF document text
    • http://homeolimp.com/1025702368878w5e.pdfIn PDF document text
    • http://thefortykuti.com/classical_guitar_left_hand_exerciseskbk98.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/iIH06QZ/circuit_electrique_interrupteur_avec_voyant.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/WeYWNic/cozmo_vs_vector_fight.pdfIn PDF document text
    • http://sallles.ru/dopizidajalikalw5u9b.pdfIn PDF document text
    • http://itfamily.pro/danganronpa_2_trial_5vvvi9.pdfIn PDF document text
    • http://gta-msk.ru/larominijignnnxm.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/TwhbjjF/87922704304.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/can_i_transfer_my_lifetime_tivo_subscription.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/chemical_reaction_and_equation_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/tisiweximedukemulobe.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/75262849126.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/positive_psychology_online_course_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/prayer_prompter_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/kujof.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/zajulebavisufimuranis.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_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 5324 bytes
SHA-256: eed95e0f92d054f756013ae336be310216cd486ff2a21b7f09ae61f8505967a0
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 10640 bytes
SHA-256: a285071c88c87b3d73607f3596744cb2c412353df85c1cd220a721aa5c859b44

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