Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1ef6ff3434b379…

MALICIOUS

PDF

78.4 KB Created: 2021-03-30 11:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 87f735602621f59220d72c5ca2a284ec SHA-1: 281c42d0de9940edd49f997b2b850cdc232b989d SHA-256: 8c1ef6ff3434b3795a9473d44a81f8d30c8660643820450d6c924b9cd808f4fb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection or content delivery.

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 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://soxebez.ru/strik?utm_term=kitchenaid+artisan+mixer+sale+ireland PDF link annotation
    • http://niburufajanuto.sportsontheweb.net/3736889167.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/naletobamoxi_fijidela_navepumuruku_zijaroku.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/lonemifefezem.pdfIn PDF document text
    • https://wigitofeza.weebly.com/uploads/1/3/2/6/132682623/da834f09.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/finance_for_dummies_australia.pdfIn PDF document text
    • http://heleogose.online/kim_il_sung_history4qqaj.pdfIn PDF document text
    • https://tizamanana.weebly.com/uploads/1/3/4/8/134877207/wepumifigebas.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/pl_sql_developer_tutorial_for_beginners_with_examples.pdfIn PDF document text
    • http://blockhcain.host/navy_separation_evaluation_examplesqe8n1.pdfIn PDF document text
    • http://com-copyrighit.com/1920452868257ch6.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://fanuzisi.epizy.com/41404775897.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_ddd570e666b94dd3980f45fa7fca90dc.pdf?index=trueIn PDF document text
    • http://wugujub.onlinewebshop.net/what_are_the_two_biggest_rivers_in_new_mexico.pdfIn PDF document text
    • http://xirasajizobopa.rf.gd/adobe_acrobat_2017_classic_serial_number_list.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_f75908d9cf4c4bd39445b234c2e093e0.pdf?index=trueIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_8a4affc8f5844d459b433a404eb8498b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36389843-51b5-4c3d-88e1-7e5f1d4b98d3/5_definitions_of_educational_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a16f188-32db-4b49-8161-d65b2b49e5cb/1907178405.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_e85247c78d1240a986b93f39d5d44077.pdf?index=trueIn 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_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 4896 bytes
SHA-256: 0dc8e31ad97471369a92ae79532e96bdfb1db3d568ba5aac36aa90d783a57959
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 11568 bytes
SHA-256: 392793a33633534979307e83b5fe88d8cba98e6af3a3cc971f3fd835bac3ba15
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2