Malicious PDF — malware analysis report

Static analysis result for SHA-256 a098978f362ff1a8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 03:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 138744cfca138024ec8add32ef3cbd37 SHA-1: c53370191df554d60e2b91a3c69b0d8ebd4e67c7 SHA-256: a098978f362ff1a811563fc0b2723390feb611caaedb1583e38d0d0d8717b729
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xajibur.ru/wix?keyword=preterite+vs+imperfect+spanish+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465565/normal_602984bbe8d73.pdfIn PDF document text
    • https://vakogiguwowokel.weebly.com/uploads/1/3/0/7/130775334/9886778.pdfIn PDF document text
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/2e1eb387f.pdfIn PDF document text
    • https://cdn.sqhk.co/balapakufogo/jgeO4ii/55698426023.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/jLrpgcO/62909736369.pdfIn PDF document text
    • https://cdn.sqhk.co/lebexuzo/aOhjjdZ/93833248265.pdfIn PDF document text
    • https://timigotevawil.weebly.com/uploads/1/3/5/3/135329967/juguzogitugefa-wubabirum-xuvuxalaletirel-sifevonumuvugar.pdfIn PDF document text
    • https://cdn.sqhk.co/furabafezuse/ihVgfge/carnival_street_food_chef_wins_michelin_star.pdfIn PDF document text
    • https://cdn.sqhk.co/wagejino/ftELwir/setevazegezuzoweroje.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/jfS82gi/online_compiler_python_3_gdb.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/pibie7K/cake_recipe_without_eggs_uk.pdfIn PDF document text
    • https://nezovudaposuru.weebly.com/uploads/1/3/0/9/130969726/riwezafejefuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_602faf2a09b16.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/ZNbLheP/49701382620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491926/normal_602f00fe8f3e1.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/dbWa7LA/airtel_my_tv_plus_pack_channel_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5fda1e1c4f67f.pdfIn PDF document text
    • https://bexaxaxaf.weebly.com/uploads/1/3/2/6/132682125/4860171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_96bae39969de4258a9e65c1c1afba1d7.pdf?index=trueIn PDF document text
    • http://povagemu.rf.gd/luxilusepisakegu.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_f8012930d4e04accb04447be3362b0cd.pdf?index=trueIn PDF document text
    • http://fasokefukolu.epizy.com/e_extra_tv_guide_today.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_8897560a42c74d53808a614859271a1c.pdf?index=trueIn PDF document text
    • http://gapajafikotu.rf.gd/interest_groups_in_american_politics_nownes.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_4a397ab7a0dc4a428124e2a50d0417df.pdf?index=trueIn PDF document text
    • http://bipaxoxibiva.rf.gd/feasibility_report_preparation_in_entrepreneurship.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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 5424 bytes
SHA-256: b34f0651770f80673657979f6b12de8fc407fca8a331ea037f2f6cf7cb02c0a5
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 11716 bytes
SHA-256: 7d87bce087ce6d798ab55dc5b758fa043761b2821c6e937d7e37993c62c5d9d2