Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a40634af53ec4d7…

MALICIOUS

PDF

77.9 KB Created: 2020-11-12 21:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f5ba599e71f826398d78da99580c5ff8 SHA-1: 10dbb6564084fc7cbcb36c880de7db84b1ac0f8e SHA-256: 0a40634af53ec4d7ae37d17f8e9c01506ddb168da9a4b9606b3dc9d90fa07a12
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on disposable domains, indicating a link farm designed to distribute malicious content. The presence of a link to a known malicious redirector further supports this. ClamAV detection and ML classification confirm the malicious nature of the file.

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/aws?utm_term=crusader+quest+weapon+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5f99c07b7c17c.pdfIn PDF document text
    • https://mipekemodowopu.weebly.com/uploads/1/3/4/5/134584650/wulowukakutixolomo.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/f78fe920d5b776d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5f9c746616b07.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/gidexoma.pdfIn PDF document text
    • https://bujugerevik.weebly.com/uploads/1/3/4/6/134677448/5327586.pdfIn PDF document text
    • https://kenolafopufa.weebly.com/uploads/1/3/4/5/134528829/698259.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/ganelife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f872c72098c5.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/vukusa/bexevizifugebojuloz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b52782-5759-4bfc-a19f-373c67ceb11b/wutirarufokorawuxudur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965bf53d-cbeb-470b-bad1-37d4b8db5629/vw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/41194411507.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 5216 bytes
SHA-256: ca2a651be885eb9a0f350827c22365f866b551a315361e7ba4e798bd12d83328
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10844 bytes
SHA-256: da9e7c5c3aa5d8bc7b4e14477d9652dc6872882e9e08e3e3cad03ed9297ce861
font_02_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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