Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead79292b5d64c5d…

MALICIOUS

PDF

86.9 KB Created: 2021-03-09 14:22:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 762f3afde1af101feda456300739c861 SHA-1: e9cfae1247844c61839668289e3aaf30b6ee25f5 SHA-256: ead79292b5d64c5d45478e268e5656f85ecee2cb768a526b27ece9dedeb42e04
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://zajinet.ru/aws?utm_term=pc+gamer+review+starcraft+2+legacy+of+the+void PDF link annotation
    • https://cdn.sqhk.co/tunuviju/cgjR4jc/90061013890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5fe80210dce00.pdfIn PDF document text
    • https://rupedotumimeto.weebly.com/uploads/1/3/1/4/131482941/jigulobofajexivon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_601436ab27b33.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/WE23Vje/real_gangster_crime_mod_apk_download_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/Fjhjfjf/3d_sound_effects_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/hiOkjaa/rdr2_companion_app_pc_verbinden.pdfIn PDF document text
    • http://replyua.site/poesia_coral_para_jovenes_de_secundariagb9s3.pdfIn PDF document text
    • http://bigswinner.space/suwumudunanemedusegiduvhxn9.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/73iiyy9/mobile_data_switched_off_but_still_using_data.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/easy_vanilla_cake_recipe_with_buttermilknlaim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_60159a59a2893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_6037d515f0e2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_60138a83221dc.pdfIn PDF document text
    • https://fupiledur.weebly.com/uploads/1/3/4/5/134527701/witasepefoxivafarak.pdfIn PDF document text
    • http://classkaod.ru/vekenovisomrvi9z.pdfIn PDF document text
    • http://upsbox.ru/33220133749nm1ap.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/gadumagabusodel/59564916002.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_c2703da7b6804edb9b2f47369e2a8174.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/natewared/ludorumusepukujew.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_254e91b3f8c84af0918c10e2c7691f0c.pdf?index=trueIn PDF document text
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_04527275b2794d5c98239bea7cdc5a0b.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_57fbe64629334d968b24e779ac262565.pdf?index=trueIn 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_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 5824 bytes
SHA-256: 74710398a6eaa3b4e413685aa8669d50203a94f6ed7c3e60d9d4920c59de7266
font_01_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 10708 bytes
SHA-256: b5fd7f0ea44db90df107b6bf4bf1b5b0db7eae295f936e6e62f134e606708c67

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