Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c560d7a4f424a8…

MALICIOUS

PDF

84.5 KB Created: 2021-05-17 15:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd4cf6e5d2c58f260bd6772e1be4a434 SHA-1: 159971c116b7272af05324326ab7421b03f8d418 SHA-256: 77c560d7a4f424a85dad0fc5c94492b46131e7d633e176ea2f2bf30c884b524f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it is part of a link farm designed to drive traffic to various websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the presence of numerous URLs points to a content-driven attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=visual+pleasure+and+narrative+cinema+summary
    • http://khanapoorti.com/parasitologia_rey8eu3j.pdf
    • http://goldalbum.ru/program_arduino_nano_via_uno_with_icspm8wde.pdf
    • https://loratabupufedev.weebly.com/uploads/1/3/2/6/132695903/1ababb0bf9f.pdf
    • http://hisgohar.site/ateten_gmlek_roman_tahlilin4nvo.pdf
    • https://sasujenag.weebly.com/uploads/1/3/5/3/135337218/fomuxi.pdf
    • http://copyright-securityx.com/come_disattivare_aggiornamenti_automatici_app_androidte13v.pdf
    • http://carins.info/is_it_possible_to_do_strength_training_without_weightsosj1w.pdf
    • http://begdas.fun/a_discovery_of_witches_season_2_cast_gallowglasstvmok.pdf
    • http://tertov.xyz/xixusirajasapawupefijets4ed3.pdf
    • http://yatvoyya.fun/how_to_apply_for_2_year_old_childcare_funding7kptr.pdf
    • https://jibeguviju.weebly.com/uploads/1/3/4/7/134723477/8251280.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_37bbf5c048f840b4868135a1629c5826.pdf?index=true
    • http://sasopapodudijeg.rf.gd/189989373.pdf
    • http://dojukagufeni.epizy.com/individual_development_plan_goals_for_work.pdf
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_3800415d7e7f4a4594df352188c09684.pdf?index=true
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_b40e692000264a25b24d31dafd69caf2.pdf?index=true
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_c40650eadbca4362b9a61faea9805763.pdf?index=true
    • http://fokerek.epizy.com/amp_human_performance_where_to_buy.pdf
    • http://zuzipidagazetu.rf.gd/gagomavedajajewodeti.pdf
    • http://pakafadudu.epizy.com/forces_and_motion_worksheet_2nd_grade.pdf
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_92a2ea324e5144deb7adc5c23cf6dfe6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f509.bin
eddce277f9d94509c2c9197a73784363da3b8cd04c5eaa67d6c86d1c34ec0a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 5348 bytes
font_01_sfnt_off00010733.bin
42a81d3d48f17459c0447899d100251a4eb87877036eb75e2ef3f05f2abb1be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 11136 bytes
font_02_sfnt_off00012ccc.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 16204 bytes

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