Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab713ee96c420078…

MALICIOUS

PDF

71.5 KB Created: 2020-11-30 19:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3ea2387dbbcd35b7c68545246435f919 SHA-1: 1d10b533b7a47af74cf6f7a870f5085dd89726ef SHA-256: ab713ee96c4200783924a83857f9611aed10e8b87c79abd93bdf53bf674b1bd2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a link farm or SEO spam campaign, evidenced by numerous embedded links, many pointing to disposable hosting. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of malicious links and the overall structure strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://ggtraff.ru/123?utm_term=romanticism+vs+transcendentalism+ppt In PDF document text
    • https://buxiwizekekaxe.weebly.com/uploads/1/3/4/6/134662233/satenetefaw-bunirone-maditugelus-nesaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_5fb79f591658e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_5fc37e3c5a420.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/xozupemobalutuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5f8d0d8e4e9e1.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/vagebojesamisovala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f8a712424113.pdfIn PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/guduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f8fd88f7d0fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f9b2da78a023.pdfIn PDF document text
    • https://sivifarikajuleg.weebly.com/uploads/1/3/4/4/134487261/gogofegufafefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0ffab8139af037645cac7/t/5fc125cd61e25426e161327c/1606493647625/11940095199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb1ce9b-787e-40bd-aa4a-a5790079ef67/clean_9_side_effects.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0ff8f3de5e49b52bb8f6/1606291449405/zowafurusorubuwokog.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_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 5284 bytes
SHA-256: 611dbe2eab2c6a643a09e9d701bcca2b9f50c8c09f9d00390cc68714b3a5cd85
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 15068 bytes
SHA-256: 638777aa3be816e2a1f34b5ec2604bfe552fa13071ebad3850d8b03e3e138601

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