Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be4766d91fb0c62…

MALICIOUS

PDF

88.3 KB Created: 2021-03-17 10:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d956fbb4368c3261f73d76c96316f25b SHA-1: cac7a362a08b7b0282a505453d877b5babe33fc3 SHA-256: 3be4766d91fb0c62189d17d971d871d0ffc9bd2a80d27e38f5824527d572f005
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute phishing content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

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://nipisod.ru/strik?utm_term=1.7+periodic+trends+worksheet+answers PDF link annotation
    • http://noxogejukebe.mypressonline.com/que_es_el_employer_branding.pdfIn PDF document text
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/901e0b2e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fe09aba3a407.pdfIn PDF document text
    • https://zawoxabupuw.weebly.com/uploads/1/3/5/9/135990747/7003104.pdfIn PDF document text
    • https://noxolawozin.weebly.com/uploads/1/3/1/4/131452883/fafeviviloxafiz.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/dreamworks_how_to_train_your_dragon_legends_book_of_dragons_full_movie.pdfIn PDF document text
    • https://duxuxapuxud.weebly.com/uploads/1/3/5/3/135332588/7300350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_604e05ad761a4.pdfIn PDF document text
    • https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/gigalugarivimi.pdfIn PDF document text
    • https://gagezomelebagam.weebly.com/uploads/1/3/1/6/131606069/vufugided_tudajiwati.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/vaxijadawiveje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/532c89ae-4696-4eb9-abf0-732ed49e1510/un_mundo_feliz_pelicula_completa_subtitulada.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/onan_4000_microquiet_generator_carburetor_cleaning.pdfIn PDF document text
    • http://kojekudaraj.rf.gd/5937687417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e36d238-11b7-48e8-8b9a-ac42fdffe36d/why_is_addie_model_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d5fb0a0-e731-4fe4-bad6-b9c9cedcef5a/37306609430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076657eb-be54-4f57-8c66-00eef214ef4c/traxxas_tqi_transmitter.pdfIn PDF document text
    • http://puwedifabujiw.epizy.com/lemufoz.pdfIn PDF document text
    • http://wabelat.epizy.com/1130267441.pdfIn PDF document text
    • http://vetebiba.rf.gd/dagutulezipoxabufekumi.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_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 5352 bytes
SHA-256: 0c595dbd516225969b2ab5c4825df8b750206de9e35346764d38bff29f6aba43
font_01_sfnt_off00012c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C67 11672 bytes
SHA-256: fc2add36d8f54ec6ee3b813b18a4c7ee413cab3ea6ecd64480e0d40410e0c2b9

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