Malicious PDF — malware analysis report

Static analysis result for SHA-256 af51f3f87d1dd33d…

MALICIOUS

PDF

79.0 KB Created: 2021-04-06 07:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 88392892e2d3dc5ae83bc4515c9d3763 SHA-1: 73015bc62233f290ce76ba8cde15e5daf72fd2f3 SHA-256: af51f3f87d1dd33dd8a6bc3bd0c54c8d72db42b09ecb51b376ecf72e572019ca
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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=lithification+and+diagenesis+pdf PDF link annotation
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/wewojekuvofajoxurus.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/actinomicosis_cutanea.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/newiwogaforived-xususej-padewoxo-detazarod.pdfIn PDF document text
    • http://probkin34.xyz/19212595542fqv3x.pdfIn PDF document text
    • http://befigter.xyz/what_are_the_biodiversity_hotspotnfwut.pdfIn PDF document text
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/raruritexe.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/b6e604a0f.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/28584797876.pdfIn PDF document text
    • http://dudoxanudito.scienceontheweb.net/sisexewirob.pdfIn PDF document text
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/1502467.pdfIn PDF document text
    • http://pinerapidsrr.com/65944223501d5ldt.pdfIn PDF document text
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/pafadebip.pdfIn PDF document text
    • https://xuniwinasifobip.weebly.com/uploads/1/3/5/3/135302293/xibur-wipuris-gabozez-tuluf.pdfIn PDF document text
    • https://meverelalopabij.weebly.com/uploads/1/3/4/1/134108836/wukogudakiga.pdfIn PDF document text
    • https://rubitolagaju.weebly.com/uploads/1/3/5/3/135330326/4a9826c3d3cd6cf.pdfIn PDF document text
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/jibegu.pdfIn PDF document text
    • http://fly-drive.online/reading_incentive_programs_for_high_school_students8q5pc.pdfIn PDF document text
    • https://topasotasakaro.weebly.com/uploads/1/3/0/8/130874498/biretizezibo.pdfIn PDF document text
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/tuwupubizuse.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/are_delonghi_and_krups_the_same_company.pdfIn PDF document text
    • http://testertumentum.space/90472108428ovjlw.pdfIn PDF document text
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/7070858.pdfIn PDF document text
    • http://eurostore.info/brother_hl_2140_toner_light_stays_on0opkn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 5232 bytes
SHA-256: f791355608124355a76e67ddf3fde421b690cee69b2c4f0ad391b9ed0cfef45c
font_01_sfnt_off0001071a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 11952 bytes
SHA-256: 58213cc07f2bb066c614fc717f1ac6d6f6429aa41d08350dfc55c56c881d652c

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