Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6c4c3a5ea7c1b0…

MALICIOUS

PDF

84.9 KB Created: 2020-11-21 04:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c9678c85f91bdaf4e9f2940cb5c3214 SHA-1: 78aec1d78bbaeb2746eccff2dfc21736a1f009ea SHA-256: 7b6c4c3a5ea7c1b0f121152fdc06809b97e6899f9acd7e0a39af5391725f9e4d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous links suggests an attempt to direct users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=how+much+gunpowder+do+you+need+to+craft+tnt+in+minecraft
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f9dc66c7d7dd.pdf
    • https://cdn-cms.f-static.net/uploads/4425908/normal_5f9b822716aca.pdf
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fb3e72e7a746.pdf
    • https://cdn-cms.f-static.net/uploads/4384634/normal_5f985a89eaca5.pdf
    • https://cdn-cms.f-static.net/uploads/4458413/normal_5fa62aae533aa.pdf
    • https://temevukovekolax.weebly.com/uploads/1/3/4/6/134688950/wuwuvoxibibetajato.pdf
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f8f918ee061f.pdf
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5f9c7c4962efe.pdf
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5f8fe5b9a9023.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sifawekujiki/honda_gx620_20_hp_v_twin_service_manual.pdf
    • https://s3.amazonaws.com/falevi/activepresenter_full_crack_32_bit.pdf
    • https://s3.amazonaws.com/bufipevuril/jsp_format_number_integer.pdf
    • https://s3.amazonaws.com/fisulefajow/fatanurodawubimepugarujeb.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/ihk_bremen_berichtsheft.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaaf.bin
1e292591bbd90dc42b9a9bc25542534319f79ddcc48327542a31612c2d3f4522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 5396 bytes
font_01_sfnt_off0000fcf7.bin
f5f727004bc8841d31b2280dd327b9a940faed86a8ed752f4414ad6e9676e06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 10808 bytes
font_02_sfnt_off00012242.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 16144 bytes
font_03_sfnt_off00013741.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 4324 bytes

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