Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a1793eca959ea6…

MALICIOUS

PDF

85.4 KB Created: 2021-06-11 07:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 02ba20e851fa404ddddc913aa50ae2f1 SHA-1: b1e4ba9be991242bc3048d4aa460314db54799a9 SHA-256: a2a1793eca959ea6c261899a46fd307f3e89d471048a7d2600d51a25407478a1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://crewmak.ru/pbw?utm_term=lfg+overwatch+discord PDF link annotation
    • https://nugekiva.weebly.com/uploads/1/3/5/3/135322430/galef-fotimuj-tuvatuleruw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_60c17f9c8967e.pdfIn PDF document text
    • https://talaxosukizarom.weebly.com/uploads/1/3/0/7/130775084/47d417b4885c7d.pdfIn PDF document text
    • https://polidixixav.weebly.com/uploads/1/3/4/4/134467230/1259131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5fe291faf1b67.pdfIn PDF document text
    • https://zesajuletolif.weebly.com/uploads/1/3/0/9/130969916/4041617.pdfIn PDF document text
    • https://todegebonuvakef.weebly.com/uploads/1/3/1/6/131606144/jojekuwi_kalazomuwuv_tuxisinekovomim.pdfIn PDF document text
    • https://wivewuti.weebly.com/uploads/1/3/4/6/134698804/rutasawularume-gosiwoze-tefuromobajo-sovotap.pdfIn PDF document text
    • https://karomigotel.weebly.com/uploads/1/3/5/9/135962203/90662c299efee01.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/2450646.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/2c64fc72-a534-4a77-962e-5b2a2b149fba/dezitutisemesigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2b614a-b5ea-428d-b585-85d23fdaf624/itouch_air_se_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea0ad90-280c-4a46-a944-719f2020025e/medidas_de_llaves_milimetricas_a_estandar.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144423042/otizmi_oyuna_getir_yorumlar.pdfIn PDF document text
    • http://wiliser.pbworks.com/f/14721645598.pdfIn PDF document text
    • http://goferupemo.pbworks.com/w/file/fetch/144988809/demefufifukofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3568cb7-191e-4d1c-92fa-67b3d09e4a3e/ragunekegomiwepudola.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_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 5344 bytes
SHA-256: f4836e068b57f920ba0e7f56353aea86baa18ec8c1dc359179b7ec318bdd02b9
font_01_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 13224 bytes
SHA-256: 7982bc8d9b7eeeaf76e3a93bf0e7c4a99dab08602d6708f9259c1a60cc83e23b

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