Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffa3709b4122e4e…

MALICIOUS

PDF

76.9 KB Created: 2021-02-27 23:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7ed62072049fef2c8b31926f387baf69 SHA-1: 66f5551a72321ce3a2446d8fdc4ca7e5771f991e SHA-256: dffa3709b4122e4e6f596fc75d4a778b612267b4640320d08cdf3275b9f8df77
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 0.9998

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://nipisod.ru/strik?utm_term=4x4+pll+parity+algorithms+pdf PDF link annotation
    • http://bcpzonasegurape2-viabcp.com/85339003330ozqst.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/igidjeP/offline_wallpaper_for_mobile_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/gCs6lMY/classroom_management_strategies_slideshare.pdfIn PDF document text
    • http://dmgameplan.com/gusaxukewejulodupajetaz655sz.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/74b3a86936b0de0.pdfIn PDF document text
    • http://kwini-fini.online/up_faith_and_family_movies_2020c12ni.pdfIn PDF document text
    • http://s7hmus.org/jabunepufaxubebogadevhsupm.pdfIn PDF document text
    • https://pizosamijuge.weebly.com/uploads/1/3/4/3/134348406/kojedavumazununu.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/sujozaraw.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/ggzjhge/52734050773.pdfIn PDF document text
    • http://lovemecompletely.com/what_is_the_theme_of_the_house_on_mango_streetkzbi4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5fdd075c1eafb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_601b48b956272.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/padadutiseni/administrador_de_dispositivo_android_ubicacion.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/6236841886.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/95290757231.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/solis_30kw_inverter_datasheet.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_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 5620 bytes
SHA-256: c87d9005838338ced5fea9ff14711c243af01112ae909708a7e902d1acc98e17
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10428 bytes
SHA-256: 5d2995fb8c07c95aab579c9260c3a581a247ebcdb32bb4e8f0a6db8d18574c56

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