Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd875c72dfcc82f…

MALICIOUS

PDF

81.5 KB Created: 2020-12-15 22:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8247c47bfba00ebd1e301dbca7eb0aa2 SHA-1: bf3c246c304604e9801f8376587d6826870896e4 SHA-256: dcd875c72dfcc82febda066bf3a38a79b6bc89121c37befec6245fdb738c0b18
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, which is indicative of a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=wow+classic+warlock+builds+pve PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/7a471cc190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5f8dc17691925.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/4094417.pdfIn PDF document text
    • https://lafetewefovizav.weebly.com/uploads/1/3/4/3/134385578/kibanuxesivuduva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_5fc36af5003db.pdfIn PDF document text
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/5553339.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/dimaz-rizup-wabokini-jivapakitomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5fd5fd49ca432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5fc18ba869657.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/8556425.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/radubozufiwo/biology_textbook_campbell.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/13647675045.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/lasozuwutavatifajekijaj.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/94206099048.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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 5436 bytes
SHA-256: c6ca2323b24fc58484f51be491238e18d1f66d6a536510d6a01f8799c182cf6b
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 11176 bytes
SHA-256: 02c99fc8cd5b27e2c4f3477e516abfb2e0bb3ea3bdb760960a0f1fb664b6c2c1
font_02_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 16708 bytes
SHA-256: e37309557914d98fed4bcde19e0067ac21a2ee1705493fbe6c9aae09c4721682

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