Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff45abbc59d30a9f…

MALICIOUS

PDF

90.8 KB Created: 2021-02-16 09:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b1d15d945c34fdc2d283e1ce646e69c8 SHA-1: e3b1a99b7b38a26c48ff7f149c54a1d548eaded7 SHA-256: ff45abbc59d30a9f725c8f28f0ca0f4f2f375758c4d8c7c9bf16459bad536ec9
126 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 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/123?utm_term=how+to+make+a+simple+creeper+farm+1.16 PDF link annotation
    • http://jafetezaki.iblogger.org/21426095312.pdfIn PDF document text
    • https://waxitajoxozaner.weebly.com/uploads/1/3/4/4/134474673/visej_wolakiril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_60133a3521b5b.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/3544690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_5fd876b051bc7.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
    • http://suraweko.epizy.com/best_adventure_games_for_android_without_internet.pdfIn PDF document text
    • http://gexazavere.epizy.com/tatokifegipetep.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/mailchimp_send_template_api.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/8977302358.pdfIn PDF document text
    • http://naremijex.epizy.com/30612130692.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_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 5200 bytes
SHA-256: 423e6468d021941a1655f3adc7e625db29bbfa9426e78d4f95b2de67ef9fe358
font_01_sfnt_off00012a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A68 11108 bytes
SHA-256: a99a1049a4e94bc0d0d8c62acdb18eb0a66e192843c095e27db0f9f41f783333
font_02_sfnt_off00015041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15041 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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