Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76aaf65c3766388…

MALICIOUS

PDF

69.9 KB Created: 2020-12-24 13:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a8f66826d5e9f9ab952e31faf6b25ee1 SHA-1: 3ad54eb7ac996b7dd27cd15326c6d60cfd37bbad SHA-256: c76aaf65c3766388d1f3402de021dad59d7c8f7dfaf96a580b682d6d13c3eff0
164 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 by multiple heuristics as malicious, including a PDF link farm and a critical ML classification. It contains numerous external links, one of which points to a suspicious URL that may serve as a download or redirect to a malicious payload. The document body is heavily obfuscated and contains what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=hidden+bonfire+stories+faceless+gravedigger+full+apk PDF link annotation
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/dulaz-rafodinuwiviwa.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/VEmfhac/surviv._io_wiki_changelog.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/9be49eb89d1b10.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujuva/jfnjhhc/save_the_girl_app_parents_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/icIxFjh/word_dictation_not_working_mac.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/geradi/69883532331.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/rplidar_a2m8_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add6d4d7-fede-4ff1-99f0-ddb35f47e8c9/dezafarezixuluwused.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/43244991715.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/aggie_stadium_uc_davis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca50620-9160-4f47-a7b3-ca97ae75a04f/67048402951.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/92381998092.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 5548 bytes
SHA-256: f358a54b7152f7f8fd2c25c293ef3125789fb36a6f7b37af1c54323cd481fb11
font_01_sfnt_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 10472 bytes
SHA-256: a8b12d6d3f95a1763d5ccbbe227062aad199751aa44ed31ccd39261ac8143c49

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