Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d861aec84a3bb0…

MALICIOUS

PDF

67.4 KB Created: 2020-11-11 14:16:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 50251ebbe97deb59cc7e71177571bee8 SHA-1: 927a0ac9976fe16b2a5800e4aa59fbd5ae7e0acc SHA-256: 14d861aec84a3bb0bd3bf4f2039da2cc6aecbb0fb0c0bd85941296433e6fd0f9
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were extracted, the presence of numerous malicious links suggests an attempt to redirect users to harmful content or phishing sites.

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://cctraff.ru/123?keyword=funny+food+truck+quotes In PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/minekevitaduwal_bojubezo_xodaloxumexofi_jejife.pdfIn PDF document text
    • https://vabebixeteguju.weebly.com/uploads/1/3/4/2/134234611/tarikolosisi_kodefekapal_losatapiru_rupikiri.pdfIn PDF document text
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/de26c81adf31.pdfIn PDF document text
    • https://xavexedale.weebly.com/uploads/1/3/4/4/134475354/jegifodimepo.pdfIn PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/1125496.pdfIn PDF document text
    • https://nawowelefet.weebly.com/uploads/1/3/4/4/134498780/zolunukaj.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/bokelur/buwilirofugabudok.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/vitezuwowopelub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab926a27-a58c-4745-876a-683a0d68d945/wurazuzeriperosawika.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/lifting_equipment_toolbox_talk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f85b5d-46db-41a4-9a34-74b0aec9b6b6/5452058758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7bc506-e069-4376-ac30-4e9d388ec4b2/84379346433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c3311f4-d231-4121-b39a-c1a4f42e8dda/discovery_psychology_7th_edition.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_off0000cb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 5020 bytes
SHA-256: b8c9133ae9a95258b3a9dd8a36aa71d5a253e47681f4c6e0cd9216d48b836c11
font_01_sfnt_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 10648 bytes
SHA-256: 44ee9595edfd027384af90ab06b23515a9868c9a3516f3740fddbb4495d6e432

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