Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ba3cf280749ef1…

MALICIOUS

PDF

74.3 KB Created: 2020-11-11 20:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d5f8ad793a9d62427761be7de86ca39e SHA-1: b4088dedcc4c8c1152f21b6b894de69c011c28bb SHA-256: 44ba3cf280749ef187320c9216a7c63bddeb0c8265a4da48ad0390429ec6eeac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffine.ru/aws?utm_term=table+template+html+css+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5fa333fd45eb4.pdfIn PDF document text
    • https://xabopefasuliwik.weebly.com/uploads/1/3/4/4/134445681/6d0d2df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_5fa1aca5e14de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f9960787fbeb.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/7d131ba4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f90ef803c5d2.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/5434716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f886284f2172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_5fa5c0f7b6392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411696/normal_5f9338c8bba88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f8d1ce60a996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f98e8bcb8eaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fa537d7a25c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f8739e978b48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 5344 bytes
SHA-256: 6e7fc99e463e2479409e8c50a4c3b516a697b24284aab318c0acd9181d743f79
font_01_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 9844 bytes
SHA-256: 9aecf66d77f463ab3cc0814868a01e94bd1d5bd3e096dae97e86f81f99268ef4

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