Malicious PDF — malware analysis report

Static analysis result for SHA-256 5481c1a592a0cf4b…

MALICIOUS

PDF

70.6 KB Created: 2021-01-01 05:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 30214f37659a76f216d827c5f2af5e0d SHA-1: 9b7d8a18b35a9214c2c40443e6fd43e3fb0da47b SHA-256: 5481c1a592a0cf4bd13ee7474e12c2120954e2744463b36ea038ccf731a7bc9c
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-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.
  • 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://traffine.ru/strik?utm_term=olive+wood+cutting+board+with+handle PDF link annotation
    • https://nizidisifa.weebly.com/uploads/1/3/4/5/134505067/mubemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_5f9aec5d4727a.pdfIn PDF document text
    • https://tomavibevojivow.weebly.com/uploads/1/3/4/0/134016690/duwejudob-jajuromunoj.pdfIn PDF document text
    • https://cdn.sqhk.co/kezulegol/JhfwNuJ/mental_hospitals_near_me_that_accept_medicaid.pdfIn PDF document text
    • https://gomamatugapisum.weebly.com/uploads/1/3/4/3/134392688/3199863.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
    • https://s3.amazonaws.com/jewizopukuni/58804113995.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/dynex_manual_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/email_format_icse_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/definition_of_stressors.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/24953268606.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/video_editing_android_apps.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_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 5224 bytes
SHA-256: 139c753ce8ae78985b41ccf7e9dff996761eb1d1969d05fd01fb96dcb561f7d9
font_01_sfnt_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 10960 bytes
SHA-256: 0c6c7eec9774a090b8c2ad9e53e6e3d4e8c850687c7defa261eb9c6968bb39ef
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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