Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f240eeedd133f61…

MALICIOUS

PDF

74.0 KB Created: 2020-12-19 07:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cced5155009432db77f8dedf3c28f17b SHA-1: 9f742e1fc031cbac457c8c0b0c978f654e68e4db SHA-256: 2f240eeedd133f6102b2e729b34ac2c1e36df8bc40712d6f6b0f32e069744a23
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

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
  • 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.
  • 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/strik?utm_term=c%252B%252B+dynamic+2d+array+of+pointers In PDF document text
    • https://tobadagagu.weebly.com/uploads/1/3/4/7/134750152/pawove.pdfIn PDF document text
    • https://rewazifepa.weebly.com/uploads/1/3/4/6/134664269/bc7e42bda.pdfIn PDF document text
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/wufinojo.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/xasarerajuged.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/3c0018f72082e46.pdfIn PDF document text
    • https://resodafuwagolip.weebly.com/uploads/1/3/4/3/134313475/1742248.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/6104279.pdfIn PDF document text
    • https://fosarujup.weebly.com/uploads/1/3/4/6/134624161/bevaguze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0baa35687f52b6b804624/t/5fc24a4b9d79364840d8a3d8/1606568523851/vacuum_sandblaster_harbor_freight.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcee8a8bc8713fe6fc59a9/1606217359107/sperry_wire_tracker_et64220_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/cash_advance_request_form_word.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37b9d24b06a7eb30fb4b9/t/5fc54ea79b1ed035388ca6f1/1606766252170/47915715708.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f485cd1e280355d49316/t/5fc91df1cb4a9754b02daf5a/1607015922635/jasukuveboxixo.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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 5408 bytes
SHA-256: f8c8e88f67526737aa20e49a80648d364871abbd97f75548d072df7d2fc54d49
font_01_sfnt_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 11848 bytes
SHA-256: e8b2c60028397aadfb49d02dade43ccbb29e3e532bdbb9fa947be5dc1f68174a
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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