Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3d7eda3999e748…

MALICIOUS

PDF

75.9 KB Created: 2021-03-01 18:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7aecdb7945d46034986ca52e59b46428 SHA-1: 1212204f19619f4472a7891a4ea40704a39bd72d SHA-256: ef3d7eda3999e748812d1e1ae447f6cc5b649f85fa4cdbf090dc23d6a4660b60
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://midufefew.ru/wix?keyword=vtm+generation+names PDF link annotation
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/9c799b162d8e9a.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/how_to_make_vanilla_simple_syrup_for_iced_coffee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_6032aa6ab0a69.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/dukipufikatuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_60310fa21960d.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/95448126245.pdfIn PDF document text
    • https://gerogebu.weebly.com/uploads/1/3/1/6/131637886/1f46fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fd8d966b13f2.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/15500998689.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/briggs_and_stratton_power_washer_1800_psi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427499/normal_60141c129f5c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_602e6ea0c3461.pdfIn PDF document text
    • https://tukusalo.weebly.com/uploads/1/3/0/9/130969921/a9cd2a1f88222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_6034753978a21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fcf87430d4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_600a5501d6da1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/meludav/carmageddon_tdr_2000_pc.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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 4936 bytes
SHA-256: ee7fa8bc490d0deee9f024ae473d1061ff194745d6976572b15d9d15b1dd62e2
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 10360 bytes
SHA-256: 031fb13d0d34292c76f3bbcb0a3f3b525e2b6b3fedd39890c38734ea4acb7a19

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