Malicious PDF — malware analysis report

Static analysis result for SHA-256 5215f6ea7f03e8a1…

MALICIOUS

PDF

74.8 KB Created: 2021-05-16 02:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 061535a2637213d6041902622e032537 SHA-1: bcffcd0105805e1466daf238293a81caf093e529 SHA-256: 5215f6ea7f03e8a1425449d9132f1e12cc79ed40b1cce081eed88ca696ca0534
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The primary external URL observed is https://baarspo.ru/wb?keyword=kallax%20instructions%20pdf, which appears to be part of this malicious infrastructure.

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://baarspo.ru/wb?keyword=kallax%20instructions%20pdf PDF link annotation
    • https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/sapajipumevoven-pozakusikulire-topubuxepazip-nerameb.pdfIn PDF document text
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/gipizupematozosadan.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/91363537527.pdfIn PDF document text
    • https://cdn.sqhk.co/mozozezowos/hilQhiE/asphalt_nitro_cheats.pdfIn PDF document text
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/zezotuk_dujufozak_sajapofijidulol_dedemimar.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/f7hdRaR/dawazu.pdfIn PDF document text
    • https://muvavibati.weebly.com/uploads/1/3/4/6/134669950/4955979.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/how_to_crochet_a_dog_sweater_with_sleeves.pdfIn PDF document text
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/xajelat.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/29264758876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_45c13ba924dd485a993378b5706b0ea6.pdf?index=trueIn PDF document text
    • http://kopolug.myartsonline.com/xojijurefiwiw.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/pasuk.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_5b5ef74843f6495189193f574f80fb23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f21fbb-7d6a-4fcd-9aa9-2feb9ad952d8/britax_boulevard_clicktight_rear_facing_height_and_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed5ee16-3c21-4cc0-b4d2-1fe57c0dcd19/kexobetoxijuv.pdfIn PDF document text
    • http://fekejuw.atwebpages.com/simple_definition_of_electricity.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_6f790f1993164ef7b8d60cb3d06f3aeb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3626b0e0-b6a5-4d54-9f1d-cf0e885b2d78/64211353576.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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 5184 bytes
SHA-256: 06356d26fb13b2259667404cc00020411a1fe829e024e7707fd2562df5e909b5
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 10944 bytes
SHA-256: dda6d6b69a918a483c2234b997e0b3374b9b071f29b7085df82e250be7281390