Malicious PDF — malware analysis report

Static analysis result for SHA-256 e170112f0254c5d1…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 23:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f6a97dec259de0bbf76f10dc7fa96f5e SHA-1: c561865f96d17b938f5cc224d499be60fb990135 SHA-256: e170112f0254c5d15d2103cf7503be01c7a3993a269d415db2ea6e9e78cc006d
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a malicious document intended to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://seumenha.ru/wix?keyword=sap+customizing+implementation+guide PDF link annotation
    • https://cdn.sqhk.co/nupepewomaxu/Gk2iajc/85019266612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_600bc57c5ea25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fd2efe2306e2.pdfIn PDF document text
    • http://regse.website/awesome_nomes_de_cl_para_fortnite7sd36.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/ghVocgd/shadow_skate_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/ifJRksF/43308042914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_603795fcef3e6.pdfIn PDF document text
    • http://seomagnat1.online/49340385510ststf.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/ijMw3ih/gonafurajetixoxop.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/hcPighi/43110865496.pdfIn PDF document text
    • http://specialsale.info/metrics_and_measurement_worksheet_answers_key_chemistryj1zlh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368266/normal_5ff54337bf1ac.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/getomonajixuvawar.pdfIn PDF document text
    • https://cdn.sqhk.co/supekokabe/5cOgdxy/95756516274.pdfIn PDF document text
    • http://reznitskygallery.com/midulasunn4pqd.pdfIn PDF document text
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/pitaretemilufugopo.pdfIn PDF document text
    • http://kungfumalibu.com/chng_trai_nude_vi_nhauh0ojf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497370/normal_5ff790e1c04c7.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/6gcWYig/tai_game_fighting_tiger_liberal_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/gdv3ibc/5199336936.pdfIn PDF document text
    • https://gurelupukuji.weebly.com/uploads/1/3/0/7/130775622/kutojaxevewuta.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/5d38b7a6-455d-4e43-9e3b-d26131f7c67e/honda_trx_350_4x4_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c05340-940c-4a63-9fce-35f83c3d9bd7/blood_bowl_2020_rulebook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1822e4ba-2909-4c75-a2a9-7162fcdf5efb/why_is_my_brother_printer_status_offline.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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 5448 bytes
SHA-256: 9233c02e12d138451b4749074165dc052d72f367074b42cd79d42c855a2a0f5c
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10684 bytes
SHA-256: e36b412b8214f62306e4a3fc88697fe6350162fc9ce4a2c7a9836c9072bfda10