Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45b6748c7203eb8…

MALICIOUS

PDF

74.8 KB Created: 2021-02-20 03:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 637759febec8aa38ee9de068f30adbf1 SHA-1: 69e60bae26b1e9df5e608f20204d2290bc2b1e13 SHA-256: c45b6748c7203eb85281a107e7b3646de6e7fedc09211e12234400d855a05b23
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a potential link farm designed to distribute malicious content. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=chocolate+black+and+tan+cream+red+miniature+dachshund+puppy+for+sale+connecticut PDF link annotation
    • https://cdn.sqhk.co/nedabuke/agc1jhg/tajato.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/hhc5EZd/jivup.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/mEijolk/true_football_3__ios.pdfIn PDF document text
    • https://cdn.sqhk.co/jefulajidi/jHKnpjd/24380911059.pdfIn PDF document text
    • https://sifijaxamop.weebly.com/uploads/1/3/4/3/134332722/6a8d94.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/dinisemowoge/jajeguletaxef.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/42253705459.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/compliance_audit_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/xedim.pdfIn PDF document text
    • http://farujage.epizy.com/linear_guide_rail_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/wusuwituginitipenado.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5608 bytes
SHA-256: 386ce530e31f06a42840c58840d4e54f0c2a9c4f596f248b5c67bf41ea82f565
font_01_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 10640 bytes
SHA-256: 73bcecd274efe64313d0bbcfb7da26ae9cb395716d9909f604dafc252a2853b9