Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd728f8576c8b12…

MALICIOUS

PDF

82.8 KB Created: 2020-12-24 12:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ce8fced725bc72d62a782e779653c435 SHA-1: e6aea079c3b511f98d91199462b06fd243b185dd SHA-256: 9cd728f8576c8b123673baa6188190c3e7afa3b0499f9d31de91864c236696b1
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs indicates an attempt to lead the user away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=extra+credit+meme+spongebob PDF link annotation
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/gamijonobemiwa-lazupilan-guzotowavitevig-lenejugewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_5fb9d4f6effab.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/nunevi.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/1855966.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/iicYNsM/43897272833.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/9898268.pdfIn PDF document text
    • https://serofijukepaba.weebly.com/uploads/1/3/4/6/134693026/lelaledek_miwewopumukoko_mowur.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/7ac0209c-cdc7-4066-9d1a-69f77bea2df5/jogar_transformice_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0ce96e-84be-44b6-8516-c0ccd0b4ebc8/inverted_l_antenna_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7079038c-7266-4c9e-b859-2f0123ac2c37/crustless_apple_pie_crisp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8b9ad6-3d5c-4c97-a1fb-711acfb979b4/30678949469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e8ac37-53fa-4c74-98a3-acca78fcbe5b/gazimenuzok.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 5528 bytes
SHA-256: 9a9917183ed254d32e5781b7181a0ef80c6d12c69d59ebb1a0e88d12c4115d04
font_01_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 2208 bytes
SHA-256: 1a936b76ba6005ffe20affd5e1fff723371846ca08dd215d47ca488a94095059
font_02_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 11716 bytes
SHA-256: c72891f9eaf303447f060878b763af26618fa3e7228a5a9c98d0671e461bace8
font_03_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 16748 bytes
SHA-256: 8c424f240076d2bb7072cb46750e086e35e0798090827aa0fe1e11ba9d860dcd

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