Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8417adc10cbcdb4…

MALICIOUS

PDF

70.8 KB Created: 2020-12-25 06:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 83b5d311ce7058329a0df48727becf10 SHA-1: 9a586375e3624b412740da837bd66b2d52521658 SHA-256: c8417adc10cbcdb453fdb0d855d2f8bb6689a7067ee03d2acfb74c2bf46fa9e7
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected the file as Pdf.Phishing.Trojan, suggesting a phishing or malicious content delivery purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=download+game+vertigo+racing+mod+apk In PDF document text
    • https://cdn.sqhk.co/kenalexuvexu/620jhkL/34430143493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_5fc04efddde48.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/xifuxas.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/dikugadamuto.pdfIn PDF document text
    • https://vaxulazazoju.weebly.com/uploads/1/3/4/5/134587837/6696691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fc3a49c3831e.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/jcqqEhj/44247222892.pdfIn PDF document text
    • https://cdn.sqhk.co/katafojedul/3flmZgc/w3schools_css_animation_rotate.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/8bb73295e.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/4c507e99-5222-4e09-9b3b-c1575da8a2f1/36731352703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46949086-9d21-46ea-a60c-943d67a98a83/42311651579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c80846-7dad-4f6a-997d-60c069720643/72756635166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0d7acb-a48f-4ca5-8c6f-b2c98b10b141/dotokufemum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff66c1a8-241d-4e4d-837f-41374d852785/19929310145.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_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 5428 bytes
SHA-256: a46cdf057995fcea9d4da3d78faa107bdf28f70ae951310a1a549659145de5da
font_01_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 13584 bytes
SHA-256: 41304dbb7b466b34dfd7ad092c6319149cd8a2d8db8340f5763088934000cce3

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