Malicious PDF — malware analysis report

Static analysis result for SHA-256 594a6a2bb77cd8b1…

MALICIOUS

PDF

70.5 KB Created: 2021-02-02 16:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ce92c5349389c8005254d16a17e3f71a SHA-1: d93752ba0bb7f5d90fe02e25cefb876e93dd4dcd SHA-256: 594a6a2bb77cd8b1c1a7cd53072df3313ba83afd6f2280003b58f409876470b7
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a large PDF link farm. The document body, though heavily obfuscated, contains text related to 'browser opening automatically in android', suggesting a potential lure. The presence of numerous embedded URLs, many pointing to disposable domains or potentially malicious redirectors, indicates an attempt to lead the user to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/aws?utm_term=browser+opening+automatically+in+android In PDF document text
    • https://cdn.sqhk.co/vipabure/gjhhDid/kingdom_warriors_of_god.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5fd146ed7bd02.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/wjb6cjb/miniclip_golf_battle_rush_mode.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/rhieBgf/14258196310.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/wiruzesotomeruzolabotakt5cbd.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/ie6ggje/vogupurigonivesotulugime.pdfIn PDF document text
    • http://duxogesubuz.22web.org/duxazikuzitasopudix.pdfIn PDF document text
    • http://btsworld.org/how_to_get_free_stuff_from_timeshare_presentationsc2v97.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/furiwasijifodimero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rejaromavovelu.rf.gd/lifenukepisisunijoga.pdfIn PDF document text
    • http://mujasanowagug.epizy.com/nakenimipesasijanizi.pdfIn PDF document text
    • http://gobobanowis.epizy.com/powerbroker_password_safe_api_guide.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/old_version_of_vidmate_for_android.pdfIn PDF document text
    • http://nifopufu.epizy.com/aparato_circulatorio_unam.pdfIn PDF document text
    • http://xuperag.epizy.com/android_appcompat_spinner_hint.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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 5636 bytes
SHA-256: dc153ac778b08017a69377a38261012757bcdf854dabd23cea28d09e8c9bd42d
font_01_sfnt_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 11772 bytes
SHA-256: 3213e628238668c8cb23b4d159dca52893d7ccb2a41a14a8fbf3739af5e04458

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