Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df7ff9cba9e5e28…

MALICIOUS

PDF

69.1 KB Created: 2020-11-24 05:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 876f239958641367ebeb3812c5e87799 SHA-1: 50a466d384e75e24736fdfd94f96f1a4db69a8a0 SHA-256: 6df7ff9cba9e5e28cc1922425594ec53781da837ea6c124b25fe46ca93a28402
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of numerous external links, including one pointing to 'trafffe.ru', suggests an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Instagram stories video' and the authoring application 'wkhtmltopdf', hinting at a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/aws?utm_term=instagram++stories+video
    • https://vubinejenifa.weebly.com/uploads/1/3/4/4/134444695/3654931.pdf
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/gojubaf.pdf
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fa584b9aadff.pdf
    • https://muwamobole.weebly.com/uploads/1/3/4/3/134356931/nivobipisun-jimunos.pdf
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/4b91f40a56ebef.pdf
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/diwusujolaxaxo_supelilosiki_zepukezokomej.pdf
    • https://sifoginugiji.weebly.com/uploads/1/3/4/5/134588619/filadezo-gopagafuvub-kabexedurax.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/debubaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wilugugo/caderno_de_encargos_sudecap.pdf
    • https://s3.amazonaws.com/fupanabivote/44239989240.pdf
    • https://s3.amazonaws.com/dojonuta/john_deere_lt150_manual_free.pdf
    • https://s3.amazonaws.com/bulozor/pizotivul.pdf
    • https://s3.amazonaws.com/navoburarovada/atlas_barber_school_nyc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c64e.bin
7de8a2fac2dd3bb478ce290f799375089254f7af7f984dbaa9584782afea3fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC64E 4896 bytes
font_01_sfnt_off0000d6d6.bin
9810582a923a7569a462cf3c09a2ca763a9bd646dff2e226c2a4198307024158
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 10156 bytes
font_02_sfnt_off0000f997.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 4324 bytes