Malicious PDF — malware analysis report

Static analysis result for SHA-256 82271f203da14987…

MALICIOUS

PDF

74.8 KB Created: 2021-02-16 01:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 334f72e3b7a4ace4c7ca56d4db4372e3 SHA-1: 3a72c2909ed518c977a9ca9afcc941cfe2e3bf65 SHA-256: 82271f203da14987b82bb3ce28f197de0241fd47df2682058986bba55bedada7
186 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 0.9997

Heuristics 6

  • 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.
  • 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://leonvi.ru/wix?keyword=fnaf+1+office+gif PDF link annotation
    • https://paseselok.weebly.com/uploads/1/3/1/8/131858791/giveviwut_xelaf_xudidiremuw_difefup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_60269c6fc13cd.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/jfjf2e8/arcade_games_emulator_online.pdfIn PDF document text
    • http://gbarb.me/pudigumalotpr0pw.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/hdgjolS/funny_alarm_sound_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/jeposanop/fOsHhhE/pixel_z_hunter_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/iagfjeQ/orange_gamecube_controller_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugixud.epizy.com/triangulo_carotideo.pdfIn PDF document text
    • http://balanuvanatitan.epizy.com/55572092663.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/general_application_for_employment_template.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/fallout_new_vegas_companions_ranked.pdfIn PDF document text
    • http://lemibutudigosuv.rf.gd/talopivugevidi.pdfIn PDF document text
    • http://wevevaviz.epizy.com/17041105168.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 4748 bytes
SHA-256: d4d1bedc0e109d5f7c792d5714abb898d42a1fdc925e1a0a9e767193d07555bc
font_01_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 10292 bytes
SHA-256: 3fa6222dd53033d51bbd09f276be54d72ceb8c86f35f45da5f3999aac262a75b
font_02_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 16164 bytes
SHA-256: 3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994

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