Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7efd8efd092b937…

MALICIOUS

PDF

75.4 KB Created: 2021-03-14 00:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6093185d0c5ebc30dec767d61b77c1ec SHA-1: ec9a93b532920f03a0f252882fdf54421ed7dd32 SHA-256: d7efd8efd092b9379e7d05bc8eb65696e9bb2027e5690c320773d7751a46c6df
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm or SEO spam. Some links are associated with potentially malicious content, while others are confirmed benign. The primary purpose appears to be directing users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=marvelous+designer+tutorial+pdf PDF link annotation
    • http://aycotoro5.xyz/re_zero_light_novel_volume_10_synopsishtftr.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hjasIih/filubakufabonajozijovom.pdfIn PDF document text
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/5358311.pdfIn PDF document text
    • https://bozaxemavokasum.weebly.com/uploads/1/3/1/3/131383719/pejumodufaru_tifilijugik_dusovufosajim.pdfIn PDF document text
    • http://vaxozudobe.22web.org/1360743522.pdfIn PDF document text
    • https://leduxuma.weebly.com/uploads/1/3/2/8/132814900/mawiwakixakajom_rujokufovuzi_wedumosuvawojod.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/Rjbhfii/emulator_for_ps1_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/gErjjaz/34641451880.pdfIn PDF document text
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/5af0a96a97.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/gTsZoRw/99629305677.pdfIn PDF document text
    • http://usmileofficial.site/28411382329a2o31.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/9f314.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa7e7d8-10f6-4996-8db8-b7b530510417/a_court_of_thorns_and_roses_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d3c5e5-a464-42ff-83fe-e88688c0da10/elite_platinum_epc_808_ss_electric_pressure_cooker_model_epc-808.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_a62c74e5092f4ba287c7a508d667d720.pdf?index=trueIn PDF document text
    • http://tuvufuxo.epizy.com/16530041889.pdfIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_5dca5d29091a42008eff8416817f505c.pdf?index=trueIn PDF document text
    • http://nugafafekovad.epizy.com/fojuxofalewekopine.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_70fe4b631765486081c1cc2614f24acc.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_93c0638612124116a9475cb00f9b594b.pdf?index=trueIn PDF document text
    • http://zixadadafupeg.epizy.com/how_to_factory_reset_honeywell_wifi_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6e75ef-fd7d-4dfb-9792-3a5d4cc16a06/big_java_late_objects_2nd_edition_github.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_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 5272 bytes
SHA-256: 12bb81f7d80ff9e86b5842eb50bc817aa0d0f0a334a41199ec6ee5dc38a9d9ac
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10224 bytes
SHA-256: 633f59d4b4a85cffbe11161fbae5467bb4846b17a3f189d3ef385a548cd22c34