Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e8f612ff35c2b8…

MALICIOUS

PDF

70.3 KB Created: 2021-05-21 19:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0ad2d3f046533a2c625d547195b90b12 SHA-1: b6cfb5a8c5f0b943fc912160e2899457fa2d42cc SHA-256: 18e8f612ff35c2b8417a04e7bd2e734224daf81bf5e3b3cb38bd5e60e9f5343e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=how+to+install+defiant+door+lock PDF link annotation
    • https://wixufefiwu.weebly.com/uploads/1/3/4/8/134883310/guxezola.pdfIn PDF document text
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/moririfemiga_pewubijujoxe.pdfIn PDF document text
    • https://wigazasadus.weebly.com/uploads/1/3/5/9/135974004/bosaxexojexor-nedapexiwugijip.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/4372333.pdfIn PDF document text
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/71fa94b69e1b.pdfIn PDF document text
    • https://gafojeted.weebly.com/uploads/1/3/1/4/131452963/mutevipodorasowogaga.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/vutanejizigugigo.pdfIn PDF document text
    • https://rekoxexegatetun.weebly.com/uploads/1/3/1/4/131452740/9327095.pdfIn PDF document text
    • https://xopibazoditovo.weebly.com/uploads/1/3/1/4/131406935/3463367.pdfIn PDF document text
    • https://jinebirusaxigel.weebly.com/uploads/1/3/5/3/135309673/c893e1bf1f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_6008fae58c868.pdfIn PDF document text
    • https://sikevitexin.weebly.com/uploads/1/3/5/3/135301450/gixikavu_kajamomaxewuxuf.pdfIn PDF document text
    • https://xanavixigusom.weebly.com/uploads/1/3/1/4/131453194/2519649.pdfIn PDF document text
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/ba9d46461c6.pdfIn PDF document text
    • https://roxodebovak.weebly.com/uploads/1/3/1/4/131454305/ed88c31.pdfIn PDF document text
    • https://kikokemez.weebly.com/uploads/1/3/5/3/135331375/3326753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_602fd406db035.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/7695073b-b954-495d-927e-ec1e925c9ad2/how_to_make_arbonne_meal_replacement_shake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbaebb85-d311-403b-8c2c-42d3a0f22c89/92662564786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39774b03-8c31-4301-94a4-e3b2e8bc4963/how_to_get_auto_clicker_on_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4607cd52-9aa5-4ae2-bd49-108374d99b3e/76940926383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d95a16-3342-43d7-9e9c-b688d035eef4/can_i_still_renew_my_ca_drivers_license_after_it_expires.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_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 5132 bytes
SHA-256: 62e2c46c6fe1d3d7439f86ef62dce979ed2f450d3bc0905112e4afffc62b11a0
font_01_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 10096 bytes
SHA-256: 6c2134fc022ed10082852c59e8c690de4bf8532e9a9ed2f9c550c7447482481b