Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d4b66c983293fe…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 17:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: efe504a5b43aa3e92f56d891f167ee5a SHA-1: 4dafe34398c3cf030079fbb01ef2467d22ee3c45 SHA-256: c5d4b66c983293fee39d8472b633f55b9748485e3659a31c947e336696f52c57
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to reference a 'Brookstone smartset alarm clock manual', a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://jacksth.ru/wix?keyword=brookstone+smartset+alarm+clock+manual PDF link annotation
    • https://cdn.sqhk.co/karadirimose/Ciciahh/different_tie_dye_techniques_for_shirts.pdfIn PDF document text
    • https://linowatudevenur.weebly.com/uploads/1/3/4/5/134599813/619475.pdfIn PDF document text
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/7313464.pdfIn PDF document text
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/12af6636351.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/zhfhdij/1531175089.pdfIn PDF document text
    • https://fafofezun.weebly.com/uploads/1/3/4/3/134338513/sezexofugezelesek.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/9730511.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://notalopelovawu.epizy.com/xurijuwiwizemukademu.pdfIn PDF document text
    • http://sejedusodumevu.epizy.com/10190606428.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_0e2eccade214482fb48534bdcc57693c.pdf?index=trueIn PDF document text
    • http://gekekenam.rf.gd/game_beyblade_android_mod_apk.pdfIn PDF document text
    • http://pifajipap.rf.gd/mifefek.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_3ef2ee406fbe4c7ead619588e81dfa2d.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_de3e88e1335f491f970705d28e5d2e7d.pdf?index=trueIn PDF document text
    • http://vunibem.epizy.com/aplikasi_video_instagram_ios.pdfIn PDF document text
    • http://renawexit.epizy.com/naruto_powerful_shippuden_apk_mod.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_dc26ba8a5c274559a57f5fcf1346bde7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df65d1da-9517-489b-97bf-98fd81914d8d/vtr_secrets_of_the_covenants.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_5e44259da39f4fdbb25586f2993c0ad9.pdf?index=trueIn PDF document text
    • http://jasigobup.epizy.com/sap_analysis_for_office_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79fc1aca-f702-4a8f-a475-ce0e05d88c24/jodatevoviboti.pdfIn PDF document text
    • http://gelodolisez.epizy.com/why_is_my_fridge_water_not_cold.pdfIn PDF document text
    • http://gixunov.rf.gd/42292529760.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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 5056 bytes
SHA-256: 3a0dadc645ed4aa6f0f41f278e13dcd1b136180ff658125294b8b19ba57c9049
font_01_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 12148 bytes
SHA-256: b0f6474fccbe1deb916f7be0dd1ad130cbe3846b980f048d64d3eaf0acc83ee2