Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ebdf649bf9d3f5…

MALICIOUS

PDF

77.9 KB Created: 2021-05-11 19:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cf2c574b59f015907a1b6075734c703 SHA-1: c29b2569a77cd0856a2ca2abc88bd7079ce12e23 SHA-256: 38ebdf649bf9d3f5bbe837b97456055f25afe7ae42d1bf10c10bfb4424496cb9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to a link farm designed for SEO manipulation. One prominent URL, 'https://botokaw.ru/strik?utm_term=john+deere+310sg+service+codes', suggests a lure related to John Deere service codes. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=john+deere+310sg+service+codes
    • http://lnstgramhelpcopyright.com/migabanukegimaz1xdr.pdf
    • https://static.s123-cdn-static.com/uploads/4499653/normal_6003f133b5ae1.pdf
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/70e0082.pdf
    • https://cdn-cms.f-static.net/uploads/4405953/normal_6029b4a161953.pdf
    • https://vulotimemoje.weebly.com/uploads/1/3/4/8/134846769/6121230.pdf
    • https://tapifulo.weebly.com/uploads/1/3/4/3/134345172/jiraletuverik.pdf
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/7f36f83.pdf
    • http://kindraretterath.com/how_to_relax_tennis_elbowl4izc.pdf
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/4965923.pdf
    • http://cheapkeys.site/robepomulujafafavarkfds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/roxawo/bronte_books.pdf
    • https://uploads.strikinglycdn.com/files/dc322f8f-70d1-4157-af59-8337ed29ba50/precalculus_textbook_mcgraw_hill_answers.pdf
    • https://s3.amazonaws.com/wifiduxezo/aplikasi_adobe_audition_for_android.pdf
    • https://s3.amazonaws.com/roxawo/espaol_lecturas_primer_grado_2000.pdf
    • https://uploads.strikinglycdn.com/files/ccb6ce22-ac3e-4906-8ff8-e234ec6927e8/ejemplos_de_actas_de_reuniones_de_trabajo.pdf
    • https://s3.amazonaws.com/viwoxuz/24v_dc_geared_motor_datasheet.pdf
    • https://s3.amazonaws.com/tofizo/jeralekobole.pdf
    • https://uploads.strikinglycdn.com/files/c1252824-2061-4781-834e-ea82e1e40af6/does_sony_xplod_have_bluetooth.pdf
    • https://s3.amazonaws.com/widofafane/are_public_relations_jobs_in_demand.pdf
    • https://s3.amazonaws.com/nitirew/appalachian_trail_map_north_carolina.pdf
    • https://s3.amazonaws.com/jamuluvuvava/wolomiwe.pdf
    • https://uploads.strikinglycdn.com/files/bf230af1-994e-4bbc-a535-4406a05ffca1/dujexexujalesonavebibev.pdf
    • https://uploads.strikinglycdn.com/files/5982b045-69dc-4a24-8207-cd6696385fa3/mukuxapanokijanunuri.pdf
    • https://s3.amazonaws.com/rogugagatuf/think_fast_and_slow_audiobook_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e3.bin
f21c3eca921099765ef5c08be681fb3bb944389197bf0832a69ec4b48d1ad3d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 5368 bytes
font_01_sfnt_off0001032d.bin
3b08c0dec705f1057b50529353518d218100fd02b969226d16e39d192ae9f13f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 11424 bytes