Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72c2b0b722fc6ce…

MALICIOUS

PDF

82.7 KB Created: 2021-05-30 21:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 701e66261cdc0076ab0ba42b8f2cb278 SHA-1: ab0a7ae4dc05e8706297e7622999c365656cfa87 SHA-256: d72c2b0b722fc6ce20e6b3cb40766d65ca824e72481ea6efabac7e279b25fa88
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 0.9996

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://zajinet.ru/123?utm_term=kalimba+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443344/normal_6057b789ac919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc937eb164d0.pdfIn PDF document text
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/770de287.pdfIn PDF document text
    • https://midubumiw.weebly.com/uploads/1/3/5/9/135989619/a25ca.pdfIn PDF document text
    • https://kebomekol.weebly.com/uploads/1/3/5/3/135349545/5859963.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/konaxoje.pdfIn PDF document text
    • https://fofagova.weebly.com/uploads/1/3/4/3/134313529/09f8b8c549fc39d.pdfIn PDF document text
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/vavopefalonorilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_604e7a8a2c8c2.pdfIn PDF document text
    • https://xupotigoxurope.weebly.com/uploads/1/3/4/6/134657266/tagez_favad.pdfIn PDF document text
    • https://sojisesoto.weebly.com/uploads/1/3/1/4/131437607/xitavikatufu.pdfIn PDF document text
    • https://dobivevoxopu.weebly.com/uploads/1/3/1/4/131453544/d807787a7c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391319/normal_5fddf86616f90.pdfIn PDF document text
    • https://gosidobesek.weebly.com/uploads/1/3/4/0/134017516/3efbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529095/normal_606444e81a419.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/sakejonazipak.pdfIn PDF document text
    • https://kunobutos.weebly.com/uploads/1/3/4/2/134234797/gimizamot.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/32975d7e-8c11-4a91-af94-cd1e1902eac5/woxoliwewodiwurozisaxite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307ee2cd-bb56-40f4-a0ed-a03aa7497eba/volvo_xc90_maintenance_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1154fc-5c90-4e4e-bd1d-55be415db401/99663998048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b855755-5197-44f4-a848-1b6c913b9712/legend_book_by_marie_lu_movie.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_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 5120 bytes
SHA-256: 8b02b9d461d4200acc873f25fa66eb05464695d1d743fdf9a2f21dfab98a7349
font_01_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 10828 bytes
SHA-256: 28932ab811e906479c3d2b2c5e1c51f48a4da054c4bb5349d22997cab2197fd6

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