Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4a284615772962…

MALICIOUS

PDF

95.8 KB Created: 2021-06-01 14:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ab4a13670e8edc1cad03d2328d5fea6 SHA-1: 94b8f652c1fb4e60289126d48040a4a8f3ef2e0f SHA-256: 1d4a284615772962fcc7aa9942d48b5f4ced835ddafe7304c0ed43242a585717
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://drafthe.ru/pbw?utm_term=sharad+purnima+vrat+katha+in+hindi+pdf
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/povexi.pdf
    • https://vejazejama.weebly.com/uploads/1/3/1/3/131381369/tapitoniluti-sikanimafor.pdf
    • https://cdn-cms.f-static.net/uploads/4388052/normal_605f5b274f3ba.pdf
    • https://xokotenesuku.weebly.com/uploads/1/3/1/4/131438709/tomorodi.pdf
    • https://kidogotetivi.weebly.com/uploads/1/3/4/3/134375399/3760559.pdf
    • https://tegeluvosuvu.weebly.com/uploads/1/3/4/8/134873603/1024e8d4.pdf
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/nuxogolifekoku_narix_wodurodixofu_tezamumokevug.pdf
    • https://terigemi.weebly.com/uploads/1/3/1/8/131856376/worazebagubata_votiku_rotebilumaf.pdf
    • https://zexilenepo.weebly.com/uploads/1/3/4/4/134461718/9912d.pdf
    • https://cdn-cms.f-static.net/uploads/4370528/normal_604bb85e118d8.pdf
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/484ef249.pdf
    • https://bitebizato.weebly.com/uploads/1/3/4/5/134583528/1469789.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://supatibu.pbworks.com/f/nadebuzuletiloweroreno.pdf
    • http://sofutikajen.pbworks.com/w/file/fetch/144460593/average_salary_for_gis_support_analyst.pdf
    • https://uploads.strikinglycdn.com/files/ddd120b0-c953-4774-b44b-8d0809d2566f/xejevajasolexune.pdf
    • http://pezeliv.pbworks.com/w/file/fetch/144426630/22785686600.pdf
    • http://garigor.pbworks.com/w/file/fetch/144425124/95684169747.pdf
    • http://mefijunov.pbworks.com/f/8_snf_veri_analizi_test_zml_sorular.pdf
    • https://uploads.strikinglycdn.com/files/0ece8af6-22af-4ff6-bc45-4ad2c7e4ff70/riletaboxisujipenofikov.pdf
    • http://lekuzax.pbworks.com/f/reading_inca_history.pdf
    • http://zegugas.pbworks.com/w/file/fetch/144411423/taboo_midnight_card_game_rules.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013982.bin
a0406a24d50d5983412d385e08e8658eba21a9dd303cca460a84cc5c6deee72d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13982 18168 bytes
font_00_sfnt_off0000fa94.bin
5e2fbe6698be9e81a24e0ca641ff8f81fb93d94665d50385e9dd89985295e785
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 5296 bytes
font_01_sfnt_off00010c77.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 3720 bytes
font_02_sfnt_off000117da.bin
78d8bef1c1df78bfc646501f0ae9edc28a9b211016fe94df754b6cff10d01535
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 10000 bytes