Malicious PDF — malware analysis report

Static analysis result for SHA-256 c189a90ff48712d5…

MALICIOUS

PDF

76.3 KB Created: 2021-02-28 21:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 553ad17758fa29535a5d97bb8717790c SHA-1: 1900991278589116cd6a061959d5548143769ba3 SHA-256: c189a90ff48712d55d7cf25d0c7a3de0937f6547324371bbb01f42212abe20ed
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 0.9990

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://fokemale.ru/award?keyword=what+gear+should+i+put+my+bike+in PDF link annotation
    • https://cdn.sqhk.co/minamojazi/LwjeTbR/22618449105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416500/normal_6002d620d439b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5fff54568e636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_6027d86b006ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_5fd13b707b16a.pdfIn PDF document text
    • http://sowugadawalu.iblogger.org/82836354569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417656/normal_5ffa0934873e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_5fd6490179be6.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/5c214c78075787c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_60354d7d16c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5fd0decbd3954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60298eb786d41.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/PggpVvy/microsoft_pro_photo_tools_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://towixamum.epizy.com/nikon_d40_operating_instructions.pdfIn PDF document text
    • http://nopexuwub.rf.gd/pejokagexutilobadeza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 5572 bytes
SHA-256: 6d486e1414102cac9fee61ce8b5062147d749cf2f875b0d8d963aa937935b880
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10548 bytes
SHA-256: 9eaf96d49894d32d3e58edb1deb8d2df13a9ab46e3245863a1e49b08bd45ecf5
font_02_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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