Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd76e3ed5608d29b…

MALICIOUS

PDF

82.1 KB Created: 2021-01-06 08:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0cc8542cb77b6c257561849baefa8c09 SHA-1: d5d835f7d7fb2c0db80635f9b34be1c7caf19852 SHA-256: dd76e3ed5608d29bb20c1c3a0be29a1972fd8003771bc6ba1f5fbc000df13090
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious, containing a significant number of embedded links designed to redirect users to potentially harmful websites. The heuristic firings indicate it functions as a link farm, with many links pointing to disposable hosting, and one specific URL identified as a malicious redirector. While no scripts were extracted, the PDF structure itself facilitates the attack by hosting these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/wb?keyword=early%20worm%20gets%20the%20worm%20the%20office%20episode In PDF document text
    • https://lokenomosotim.weebly.com/uploads/1/3/4/4/134499182/xubemezubememepofe.pdfIn PDF document text
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/vojuk.pdfIn PDF document text
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/39b2a15d15c.pdfIn PDF document text
    • https://dexuruxewiripo.weebly.com/uploads/1/3/2/6/132682754/depivujek-bavafarojola-vajepaduj-supilopakulap.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/j5hagiE/diriwivajilozuxabum.pdfIn PDF document text
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/wajijowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5fcb8e0fcf10e.pdfIn PDF document text
    • https://cdn.sqhk.co/vukobefebu/aESggif/emma_s_adventure_california_game_pc.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/a09f0445-da35-415e-815b-a555112f3a3f/nabiwowovuxaxakuxep.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/roxaruwegan.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/remove_password_from_excel_spreadsheet_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b4ad15-1586-4cc9-aff6-71c84950d979/42089047457.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_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 5720 bytes
SHA-256: a3cc976427576f6e93f8af8521c5e1e23c34630a4fe45c278e588788d3c78219
font_01_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 10316 bytes
SHA-256: b747499e52520e8e17a60f03e4140b0506d0dd445d97de2f05616f5d319088c3

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