Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc03abcc30fd8444…

MALICIOUS

PDF

83.0 KB Created: 2021-04-02 08:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: df6d5eeeaab8a463cd813f0938a6e98a SHA-1: 23edc7828b375fb69120a5717f5713301fd3b39e SHA-256: bc03abcc30fd8444018cd9a7dda7a5b3092b289dc45aacb571eb610216e96320
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links to various PDF documents, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://vilenefex.ru/award?keyword=bandsaw+box+designs+pdf PDF link annotation
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/1691959.pdfIn PDF document text
    • https://kopudezazuxunob.weebly.com/uploads/1/3/1/4/131408344/bumifujaxolo.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/circular_motion_mahesh_tutorials.pdfIn PDF document text
    • http://xivekoto.medianewsonline.com/rokakax.pdfIn PDF document text
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/wiboxolo.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/235666.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/wavuwejane.pdfIn PDF document text
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/fofaxenexoxutenuse.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/bose_wave_radio_review.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/pefufaviwali.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/aide_memoire_tuyauterie_industrielle_gratuit.pdfIn PDF document text
    • http://ravevuzovije.mywebcommunity.org/57004171787.pdfIn PDF document text
    • http://ninijefaligogi.mygamesonline.org/marvel_cinematic_universe_marvel_movies_in_order.pdfIn PDF document text
    • https://kuluvopejad.weebly.com/uploads/1/3/4/3/134375189/fd0347c34488.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowawaba.atwebpages.com/did_elena_and_damon_die_at_the_end_of_vampire_diaries.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_1fa482ac2fae42aea50bf8a582cb47f1.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_99bb1f409b7b4c759ad94b8f0f105df6.pdf?index=trueIn PDF document text
    • http://bidetorula.rf.gd/56894654263.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_ff38bc3be37f40ee81fa88e31680bb18.pdf?index=trueIn PDF document text
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_d3bc536f27a743bc86fb0516b3cabb8c.pdf?index=trueIn PDF document text
    • http://kogusox.epizy.com/bihar_police_si_syllabus_2020.pdfIn PDF document text
    • http://wororapuwubetuv.rf.gd/95434803474.pdfIn PDF document text
    • http://luvenawow.epizy.com/fobidunojimibanejonenuk.pdfIn PDF document text
    • http://jokodakive.onlinewebshop.net/statistical_analysis_ebook.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_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 5428 bytes
SHA-256: 1377054512d7f6bf36293c81d43f356c2fdf2e00f95a4c13f0cfc1fdfe5fb350
font_01_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 11264 bytes
SHA-256: 3c47109c7ce9a46a3370524f735e4cae7d04868918862074eb5e9bc1e34573de