Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e92a73d003f670…

MALICIOUS

PDF

78.3 KB Created: 2021-02-23 12:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bbd4bd0cf75ef2f67f4473806d54bccb SHA-1: cf49ef9dd17bec45165fab491640b5ebb38c43ce SHA-256: a5e92a73d003f670e0ff73c8f80d1ddda3799ba7ef4bc98fcf81eb487af37b3b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document's content is disguised as a service manual to trick users into clicking the malicious links.

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://yafferge.ru/wix?keyword=scag+turf+tiger+2+service+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5fdad3c444251.pdfIn PDF document text
    • https://bezulagoxirupaz.weebly.com/uploads/1/3/5/3/135347250/sitapibixigudid-tejug.pdfIn PDF document text
    • https://xutepodufolesik.weebly.com/uploads/1/3/0/7/130739265/fisifelafezasivu.pdfIn PDF document text
    • http://ralanizu.iblogger.org/home_page_template_html_bootstrap.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/pugiko-zefekitedebebul.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/ae0bd.pdfIn PDF document text
    • https://pagilosotutan.weebly.com/uploads/1/3/0/9/130970008/7093722.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/bulozor/free_newsletter_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/burivosenagojolorifevi.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/videoder_app_install_apk.pdfIn PDF document text
    • http://zuniguvip.epizy.com/naming_faces_edges_vertices_worksheet.pdfIn PDF document text
    • http://batogejupimole.rf.gd/88705223549.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/asterix_the_gaul_in_french.pdfIn PDF document text
    • http://vevududo.epizy.com/772374577.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010135.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10135 23216 bytes
SHA-256: f71e206aee217fddb11545c7c7ab0d42c60b595f5acbbb3038166bf2747413d6
font_00_sfnt_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 5496 bytes
SHA-256: 17d7d21ec7624fb255d05176ada5875a16f11f55593c04b6aa22a52026acdb79
font_01_sfnt_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 10688 bytes
SHA-256: 05aa8c7cf74f68664b77d9fa2959bd0db265c318e9d0e1c98e10499658cddf56

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