Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f3b082bfc7cb64…

MALICIOUS

PDF

76.3 KB Created: 2020-12-30 15:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4221d9630f186b65995767458585bf6d SHA-1: 06cb0ddbcce786243d484ca5343c6c4f27bc5041 SHA-256: c7f3b082bfc7cb64ba837dcb41d38ed7be094e5893864e87112331c9a2bf7f93
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to potentially malicious sites. The document contains numerous embedded URLs, with at least one pointing to a known malicious redirector. The presence of a link farm on disposable hosting suggests an attempt to obscure the final malicious destination and evade detection.

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://traffmen.ru/strik?utm_term=mechanical+energy+equation+chemical+engineering In PDF document text
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/633bfa7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_5fc2a2808a03b.pdfIn PDF document text
    • https://sewimumox.weebly.com/uploads/1/3/4/6/134668968/ab62188e6a4fd6a.pdfIn PDF document text
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/gefuwusapes-zoxajutov-jikevamafonunu.pdfIn PDF document text
    • https://xovonugobo.weebly.com/uploads/1/3/4/6/134688771/4390343.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/9c876549487.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/Fgjheib/27206888137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/56516885902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c759afe9-c6c1-405f-ac7c-06832e383291/14105272043.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/anarkali_malayalam_movie_free_movierulz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 5152 bytes
SHA-256: 1cc9666fbe6f644f16301a64bad46a96431af071c33fe2985c99a80d4825c32a
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 12364 bytes
SHA-256: a8426ae09fc906b8f49b167fdafc79838a405ed8bfab13590f616a09a68f8030
font_02_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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