Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d1d4828807f7bb…

MALICIOUS

PDF

76.9 KB Created: 2021-04-01 14:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f8e8adfe35f3b9f82d21526777645228 SHA-1: 22030455e4c27e9404367c71a9c5eeb25e20f9b6 SHA-256: a2d1d4828807f7bb9bb62bded73c8f2818a54fd16c0de4b40cde6298b1fa3980
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains a high number of external links, many of which appear to be part of an SEO link farm designed to redirect users. The primary malicious URL identified is https://gimoguvi.ru/strik?utm_term=taurus+g2c+trigger+pull+fix, which is presented as a "Taurus g2c trigger pull fix". The document's structure and the presence of numerous external links suggest an attempt to exploit search engine optimization to distribute malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/strik?utm_term=taurus+g2c+trigger+pull+fix PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474720/normal_60630212dafc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_602172a555002.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/gANkVgj/76161247677.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/eyXidid/54408115833.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/iegj6dW/fefobaxekoputovubumubixuv.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/cij6gcd/iihf_u18_2020_wiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nalifij/goldfinch_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/zoritusafidemirilulevi.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/90510948896.pdfIn PDF document text
    • http://direwoded.rf.gd/sense_and_sensibility_netflix_streaming.pdfIn PDF document text
    • http://kojaburu.epizy.com/25855414035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b091df0-fe1c-4e90-8ede-a4d9de9bb096/how_to_simplify_an_expression_by_combining_like_terms_and_the_distributive_property.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/best_platform_bed_frame_with_headboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1555e4bc-fd74-403d-af14-394117990440/jizerosinoperaso.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_fb0c8e30392e4416b7f1cfd29118ab12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1966f518-3d27-47c5-bd46-46cb15632532/23579677986.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_51d0feb0283448a799cfd2f0e72c8be5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedexim/88725520328.pdfIn PDF document text
    • http://lobunuwofapow.rf.gd/bonney_forge_globe_valve.pdfIn PDF document text
    • http://mijekobafenado.rf.gd/biomass_boiler_operation_manual.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_70c7f9e5e833422e8ba1a7a24bb12fb4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 5332 bytes
SHA-256: 82d429b8df0b7717e80d06746ae0341d882c80202facbe7df79c9b64409e444d
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 11088 bytes
SHA-256: 3758c26f23a8de1c7821ccf14099a69cde6cb0d84532be05b65035425c3f4646