Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbd40795546d72d…

MALICIOUS

PDF

72.5 KB Created: 2021-02-20 18:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 84d1341c5c6acaf63c5134359bd88a17 SHA-1: 325995f8ada5683a248a791c037295a1e87cb533 SHA-256: 4dbd40795546d72d3484afa6597c5fb0ac3ed7ff09ea3be5e2cec25cccc399a7
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://leonvi.ru/strik?utm_term=remington+870+express+tactical+20+ga+18.5+barrel PDF link annotation
    • https://cdn.sqhk.co/dogutadova/hihdhhs/gs_macmanus_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_602eadad3e6a6.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/bzX9r9v/ice_cream_shop_names_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/Chiv4cM/66290411587.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/7838549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_600b36860868c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_60021b934efba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478961/normal_6006ca1a6363f.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/g6rgfhc/mugesefafagaputoxefi.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/pexuzelojonaki.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/ojgiahg/69141040531.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/I1jacid/77319927208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5fdc70d2b6eaf.pdfIn PDF document text
    • https://zanubago.weebly.com/uploads/1/3/4/8/134886268/6090072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevurevakube.rf.gd/casio_g_shock_watches_showroom_near_me.pdfIn PDF document text
    • http://jimibidubarabus.epizy.com/86233633960.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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 6224 bytes
SHA-256: d4badfadd765ed70ca4dcc3fbdd6798d33d3c904daf26afb84c7a1891137f83c
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 10792 bytes
SHA-256: e1dff2dae59621e43a61bcdf63d1cd6b9f00a24d24fe2e1997596fb36d8b72d0

Open this report in the interactive analyzer, or submit your own file for analysis.