Malicious PDF — malware analysis report

Static analysis result for SHA-256 c387fb17d5da06a9…

MALICIOUS

PDF

71.5 KB Created: 2020-11-18 13:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3cd368bc26ea34e890b61c0890c84b68 SHA-1: 254010ac2a70a28b95b8db4d7a7a4c6fff8c6cdc SHA-256: c387fb17d5da06a9e7cc234909f878f4b959125a81b83caba03b104a32a59a89
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 0.9997

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://trafffi.ru/aws?utm_term=congruent+polygons+worksheet+8th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5f8ccb8304b3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f8e245577684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_5fa05701a0d5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5faed5077e120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_5fb491334b13a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5f9832111ffce.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/wokute_motudazireporut.pdfIn PDF document text
    • https://boxolajabamofi.weebly.com/uploads/1/3/4/3/134356625/dukopakatit-vogavapufari-dusifebe-tovobunujimito.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/repuvot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f89672c0ac5a.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/purufiz/vemeba.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/list_of_bharat_ratna_awards.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/61287883950.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 5576 bytes
SHA-256: df5d3499fb5105aa5e2002a3eeddb949b27df02db7e2415922a7919fa3c32efc
font_01_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 10304 bytes
SHA-256: c5b9eed6845d09045c9e45e7d61eb86f534302ae61e4c6f2185bafbd78f1b65f

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