Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da38dd00041fa26…

MALICIOUS

PDF

74.8 KB Created: 2021-03-04 17:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0da7676f99df904e9a314c4c84c177d1 SHA-1: b2a0320c97d470532a09aa512c65b15e87a4cdc0 SHA-256: 4da38dd00041fa268718b3369e7b6a54b8f2cf420077f800b43c83af0f9d9ec8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to 'https://gimoguvi.ru/award?keyword=que+significa+asociado'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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/award?keyword=que+significa+asociado PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369179/normal_603603ba887f3.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/rejapegusa.pdfIn PDF document text
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/d06935054db8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_602ea87fbcd54.pdfIn PDF document text
    • https://cdn.sqhk.co/dejowipapoli/alhe9DL/forisato.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/2693596.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/khcidii/jowavaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_601802ae825fa.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/gihhEge/pocket_knife_restoration_near_me.pdfIn PDF document text
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/nomibo-wozewim-tifojitol-kedububuv.pdfIn PDF document text
    • http://pemirok.22web.org/mobility_scooter_replacement_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/mofinopedas/ghhbgdH/18221874401.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/4gEgjjf/tulumenomibig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_6038c6292f526.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/pulujolatepuv/wogowiperojulamamudegij.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/disney_piano_sheet_music_musescore.pdfIn PDF document text
    • http://marivugedada.epizy.com/cutting_practice_preschool_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/historia_de_una_escalera_apuntes_selectividad.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/98357780341.pdfIn PDF document text
    • http://maboduxivugiv.rf.gd/night_figurative_language_worksheet_key_34-_45.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/3254124226.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/dopizogu.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/alleluia_alleluia_give_thanks.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/gitolokefu.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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5124 bytes
SHA-256: c93c141073ca3b5003bf24fe40c0d22c58039dd0712b58ca6c7309c8f2694248
font_01_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 11488 bytes
SHA-256: 206a61123b55eca73007ad2442ea634f6015d016dff4f408b249b24237addc65

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