Malicious PDF — malware analysis report

Static analysis result for SHA-256 768b40a5f3e7c8e3…

MALICIOUS

PDF

73.6 KB Created: 2021-05-06 07:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c8110b2162517f6c78290ff8c63910fa SHA-1: 14f4db65eb9266c47df59ace3faaed45a0df7e3d SHA-256: 768b40a5f3e7c8e3ae95cc2342916449a1fd18e295d10cb347e5944a6474ca8f
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=backwards+design+lesson+plan+template+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391047/normal_5fc901bc8b3b7.pdfIn PDF document text
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/puwogexudonopi-jepevoxodizivi-gojimazu.pdfIn PDF document text
    • https://bekitatabegoze.weebly.com/uploads/1/3/0/7/130775701/5369f6b27e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5ff5073236b2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_6060be833f5c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6038ea5de27d1.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/b21582faa059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_60469d50abb8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6014d70a953d3.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/litemaz-zenuda-bitazixulamix-fiwepokanox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_604918251cf3d.pdfIn PDF document text
    • https://gaburizopa.weebly.com/uploads/1/3/1/4/131438784/nitodinewuzurutirob.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/a0337e60-5f3c-4294-86de-95591cf56bed/taxode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4cf754-441e-4101-8811-c71cc847757a/best_price_peavey_bandit_112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31eeaf07-58ef-4ee9-b996-4f58379e0dfe/66547446362.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/32355216904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77402fd-70c8-41bc-86bc-56dec5e67f5d/91691531899.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/c_async_formclosing.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_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 5680 bytes
SHA-256: 51941ccbac823e42f8a37163283b89cbcd5fe7b0f97365709de3c47be83d0d0d
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 10536 bytes
SHA-256: 8ecad2c7ed89d17f25d8a85d69599956409a78b098eb1ad663b3615a3ea942d7

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