Malicious PDF — malware analysis report

Static analysis result for SHA-256 163de05e6dea1748…

MALICIOUS

PDF

74.4 KB Created: 2021-06-01 14:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5ff6f0a265ee3ed7a746cb893a14bdef SHA-1: d2fdabc07542e583821b4aba2ae961c5f99a0d5d SHA-256: 163de05e6dea1748b33c39cb77ac5d131a119ae8840d527598ee85b43577f5f4
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which points to a suspicious domain ('coretry.ru') that is likely part of a phishing campaign. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://coretry.ru/pbw?utm_term=clasificacion+de+retinopatia+diabetica+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fd37a6d83a4b.pdfIn PDF document text
    • https://pidorisegis.weebly.com/uploads/1/3/4/7/134761928/jolajuwimene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_6069e35cd2ff4.pdfIn PDF document text
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/denoliginole-raganiba-zugiloxosarozuv.pdfIn PDF document text
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/litodikap_sugagifasu_xutebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_605975db779e0.pdfIn PDF document text
    • https://sudujosapo.weebly.com/uploads/1/3/4/5/134510416/nawuzowidefu-risilibagi-ruralovobule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letonepamusi.pbworks.com/f/kn_per_m3_to_pcf.pdfIn PDF document text
    • http://sikovifif.pbworks.com/w/file/fetch/144459318/how_to_be_a_better_platoon_leader.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/fexopo.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/38567279404.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/66616416935.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144455034/the_incredible_hulk_2_full_movie_in_tamil_free_download.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144412071/69876994003.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/pipe_fitters_math_guide.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/65338505592.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144438606/how_to_get_robux_in_roblox_for_free_2020.pdfIn PDF document text
    • http://lokiboz.pbworks.com/f/4060720562.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/gisokawigoneritexulula.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/f/77324227122.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/f/10964530209.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/bawinukodopunesewowi.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/wawed.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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 5196 bytes
SHA-256: f0989578f094dd6e9e3a066d0d2acc73a61c24a751ecb2184e463351437096fa
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 11812 bytes
SHA-256: 6a510be090a98096c75bb3d2b82915973b30a3e293a934f057e0e5ac385a2470

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