Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21ee06bd826629f…

MALICIOUS

PDF

80.3 KB Created: 2021-02-22 12:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aa64d5c01da21de8a1cc3959ef30b3cd SHA-1: a7996dc3036885db5208f4f07db27c3084bb806d SHA-256: a21ee06bd826629fcf888fd8a2a59b7716bde68203e9199ffbd8f53439404745
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to suspicious and disposable domains, with specific heuristics flagging invisible links designed to lure the user to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to meeting guidelines, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/123?utm_term=guidelines+for+chairing+an+aa+meeting PDF link annotation
    • http://bilkaita.space/44679351254nohil.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/kuriviza_loxux_numanatabibom.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/aicgihj/zombie_farm_2_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/GQigEjb/ice_hockey_news_magazine.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/zoperakevagirazurori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fd2b0bd3814d.pdfIn PDF document text
    • http://ig-supportcenter.xyz/velag8uru3.pdfIn PDF document text
    • http://nakanilo.club/turedejazererunapmdq17.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/detuki_dowiwo_fuzuxivaxuvom.pdfIn PDF document text
    • http://azorocheat6.xyz/draw_it_cute_brawl_stars_sprout0qudp.pdfIn PDF document text
    • http://docita.fun/zotufuwerojibilxjq8i.pdfIn PDF document text
    • http://itawegan.fun/476734723597o185.pdfIn PDF document text
    • http://kanshoper.site/brunton_school_uniformykaza.pdfIn PDF document text
    • http://pek-24.cc/dulofuviz9biv.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/daniwodug/frontal_cavernous_malformation_icd_10.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/kundalini_yoga_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/56705877590.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/magic_eraser_background_editor.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_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 5348 bytes
SHA-256: e3eaa9bca25e8fc1a9a73122543399e3a9f25ac2709a66b495921829b3013541
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 10572 bytes
SHA-256: c569fba50fc0892b09b16b43735df5bbaf7d7d223bb86b3fe516df82376f6c25
font_02_sfnt_off00012548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12548 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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