Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c527c3160adc631…

MALICIOUS

PDF

96.7 KB Created: 2021-04-03 07:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f649906ad5c012fc945a01f454f3e583 SHA-1: bc15ecb11d8ccf221c5f71eb78c8bc17d741c71e SHA-256: 9c527c3160adc63134486d4e97e6d91621a00a9b448f2402b8f835426bb906e9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to link farms and potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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
  • 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://pelibifir.ru/award?keyword=boy+erased+pdf+espa%25C3%25B1ol
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/funokesetani.pdf
    • https://kenuvibugitevam.weebly.com/uploads/1/3/4/7/134700053/fuwevexozo-zezagirudaxo-doxuk.pdf
    • http://elerctum.org/maserati_granturismo_2014_price_usarv75x.pdf
    • http://beamorem.com/kibomironotexenoburex6flkt.pdf
    • http://prequester.online/sofilanozebluidm.pdf
    • http://it50off.pro/martin_luther_king_junior_speech_youtubeo50hg.pdf
    • http://mylevel.store/how_to_check_2001_ford_f150_transmission_fluiduvors.pdf
    • https://xutorobufazam.weebly.com/uploads/1/3/5/3/135345650/464521.pdf
    • https://vuzodafolo.weebly.com/uploads/1/3/4/7/134732359/wuwefulizowodod-momisamoji.pdf
    • http://sibasijiv.22web.org/66779186143.pdf
    • http://tibojokotetus.iblogger.org/toronto_alexithymia_scale_tas_20_italiano.pdf
    • http://jezolagewe.iblogger.org/passport_form_ds-_11.pdf
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/wavod.pdf
    • http://momijorifuwuve.22web.org/stand_by_me_movie_pg_rating.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_881ddecec46849eeb408ed033188e755.pdf?index=true
    • http://xirewubekato.epizy.com/eaton_fuller_automated_manual_transmission.pdf
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_88e2ccbf97564c38a0b545220f03b057.pdf?index=true
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_8c9a49d3ff514a82b81b6e4a495fb7e0.pdf?index=true
    • https://b47237a6-1880-4d87-9598-f01162bab054.filesusr.com/ugd/1fe0ea_19fd09fa4ea24cadb0c1b8da84d96678.pdf?index=true
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_54e9ec50c0c545b5a64beacf5bb87ab2.pdf?index=true
    • http://sekijipaladi.epizy.com/form_example_in_html5.pdf
    • http://xuzazepixo.epizy.com/which_harry_potter_book_is_the_largest.pdf
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_fb44db051d21417b8bfd830df6e18c5c.pdf?index=true
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_f2cdfa2c20034ace83a026c8b19f845a.pdf?index=true
    • http://siresolixuxu.epizy.com/konelatekagobus.pdf
    • http://fijesuluxugej.rf.gd/vapomedowidifi.pdf
    • https://b0837e58-6fb0-4b2c-a83d-c451c4d85cc2.filesusr.com/ugd/1169b1_930e1904f2724faa8ffaaf971a3fb86a.pdf?index=true
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_959fe71f089a4a90a6d0d7d06272a569.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137e4.bin
7ea8a6ae55dee99ca23c188a452bffaeed9ac2aae6349052edafa4f4b0e9f2f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137E4 5396 bytes
font_01_sfnt_off00014a18.bin
ebf5cfc82e1a2123a90f551698c852c0e7d010c60a811db361c6ee6649cdbc3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A18 12672 bytes

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