Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c39de8e26cd3fe…

MALICIOUS

PDF

79.6 KB Created: 2021-05-22 00:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f7ad5519982848447c532b4e346b5bb4 SHA-1: 26be9066e9a7b0337b05849fb8ba5b319770b358 SHA-256: 03c39de8e26cd3fe00e80f584ec6e44445a91a690f4fcbd28c073d27e91c5d5b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to malicious sites. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate this behavior. The embedded URL `https://soxebez.ru/strik?utm_term=university+physics+with+modern+physics+13th+edition+pdf+github` further supports the lure of academic content to redirect users. No scripts were extracted, but the structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/strik?utm_term=university+physics+with+modern+physics+13th+edition+pdf+github PDF link annotation
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/pijiwasi.pdfIn PDF document text
    • https://nisozamiroxub.weebly.com/uploads/1/3/0/9/130969329/7210494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_60539d376985f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5fc5ea4daf37b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_601aeb6f68cb5.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/puvuwusenowo-kupurazuvuje-fuxelam.pdfIn PDF document text
    • https://mabalajobiken.weebly.com/uploads/1/3/4/0/134016714/5d2608.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/redivarasugabop-xiserevular-takosabowibutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_602625eee8fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5ffb1cf1c02be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_603427f99fc8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_604943389575e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_601b2fd0352e3.pdfIn PDF document text
    • https://zurozudosumo.weebly.com/uploads/1/3/4/7/134719863/livafexosigukegalena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470685/normal_60054d84adebd.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/2619316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f62a142a-855c-4451-89c8-a20b06f518f7/senior_geotechnical_engineer_salary_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed8ea2f-5017-4cdb-8874-75b84775e924/how_fast_does_a_roller_coaster_go.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd31dcdf-8aaf-4089-ad7b-35c6f7bdcb63/marshall_mcluhan_annie_hall.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/88376088477.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/mugiruretafi.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/68714131388.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/nikon_p510_camera_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/mailgun_email_template_builder.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 5812 bytes
SHA-256: d7a11d87b2c3716037e9e0564b6c1fa499904af688aba14982f29e2c0f9b7322
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10764 bytes
SHA-256: 6dff55f6267a37ecc1914d1b1642949c18f5a2c92168cdc65b87939d902e033e
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3