Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd4adbc7ca21185…

MALICIOUS

PDF

67.1 KB Created: 2020-11-25 10:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e16db7ca116d04b329b72a5bd0b9b9e1 SHA-1: 0757380f62fe8ff61fd7a12ecd1c9cbe6b806ef6 SHA-256: 9dd4adbc7ca21185d23fbd2112920bdcc011e882b05cfda23cfdd3abfc1bbe42
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with heuristics indicating it functions as a link farm and redirects to malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the document's structure and embedded URLs point to a malicious redirection scheme.

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
  • 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/strik?utm_term=vizio+soundbar+remote+codes In PDF document text
    • https://genaseturatu.weebly.com/uploads/1/3/4/6/134615139/xegogeroxanoful.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/8882364.pdfIn PDF document text
    • https://gemefakopegixi.weebly.com/uploads/1/3/4/3/134309359/jamuderutupajifuw.pdfIn PDF document text
    • https://falababipudin.weebly.com/uploads/1/3/4/8/134847750/tusupazefupolaf.pdfIn PDF document text
    • https://poxokisajape.weebly.com/uploads/1/3/4/5/134592502/c1d7ece.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/rikala.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/07b6c8b8-b9da-4536-b1fa-aea88ba2e403/80979285473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578947b0-7a72-401d-8af0-f3bc73ca5088/xojuwirojikibikuzezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a1369d-87c8-46a1-ac8b-c93d59483027/zolafabixojuzud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddcde07-86cc-4b13-a1c8-f877b160d3c2/kavowiniwapapipejabebup.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/xumegowoxadav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf1c9cc-60e3-4f04-a2d9-5b1aaa68273c/84736511838.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_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 5208 bytes
SHA-256: e2ad97245aec5a1f9b371bf6c4b3262b013000fbbc25b442f9046ecabee5f71f
font_01_sfnt_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 10472 bytes
SHA-256: 30ecc3738766aa187b896db004340d69db16ec2efdc0cd5c328c57c547528e4a

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