Malicious PDF — malware analysis report

Static analysis result for SHA-256 100bfbd00188e86c…

MALICIOUS

PDF

67.5 KB Created: 2021-02-17 11:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 040284aca938ba9b0009e6fa5174daa1 SHA-1: 4cf62c94a52eaba516692d51b96f189b4da6af43 SHA-256: 100bfbd00188e86c9dccbc2c3f3b02f5fb36c16dcf27db55cc3b8380feda8e54
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/wix?keyword=nist+800+144 PDF link annotation
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/liduxowimeduki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_601e7668d18a0.pdfIn PDF document text
    • https://mavuzoxawajike.weebly.com/uploads/1/3/0/9/130969593/guzopumituxasok-xutodep-jisona-tegubonif.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/gMf3hhQ/tomizoduto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454055/normal_5fc8c398ada37.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/5905990.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/7c93d8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5fddbf90142ca.pdfIn PDF document text
    • https://lekozeva.weebly.com/uploads/1/3/5/9/135964777/08bf38edfd0fe8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5ff3e7bd53df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426267/normal_5fe78aa0cecf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xikisefux.epizy.com/29496497275.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_off0000c316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC316 4784 bytes
SHA-256: 62f4a053dd8f3e495f39882a140b560a0d6116ef42897c3790f469eca7b6fe82
font_01_sfnt_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 14288 bytes
SHA-256: d43b6ef481a41396a8ef86ff363d095836123f67d68dad61bd08cce79aa94f3e

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