Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea37a308c4ce58c…

MALICIOUS

PDF

140.0 KB Created: 2021-03-17 16:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c869e9676b7a2f4bac899a064c06909c SHA-1: 5c9bdbfa4180e613acdc5b37e00a8025f89dc7a9 SHA-256: 2ea37a308c4ce58c453048db9af16fc5672039492968f9c0e60c46a928706e12
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. A critical heuristic indicates a 'Clipboard command execution lure,' instructing the user to copy/paste into a shell, which is a common technique for executing downloaded payloads. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9610

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://midufefew.ru/award?keyword=carbonylate+anions+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486971/normal_5fc7eb4e773da.pdfIn PDF document text
    • https://vewekazetuxif.weebly.com/uploads/1/3/1/3/131379326/mexigodiromoraxet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366041/normal_5fc5782826141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5fe9906953fed.pdfIn PDF document text
    • http://summer-italy.fun/mht_cet_2019_answer_key_official_websiteddq7x.pdfIn PDF document text
    • http://proba7.xyz/redarc_wire_gauge_worksheetw5j40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_6021a78dce4f3.pdfIn PDF document text
    • https://nugakowizadofo.weebly.com/uploads/1/3/0/7/130738823/fopoduxuruj.pdfIn PDF document text
    • http://easylearning.space/3463819964021r60.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/6RCl1DN/tiwuxusagixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_6026ef4451fd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_60333da59623b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376606/normal_6002c34dc8fe2.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/4hcqehb/amp_capital_funds_management_limited_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/ekwjwgd/15967601820.pdfIn PDF document text
    • http://ilkertr.shop/the_blood_of_olympus_covermbho0.pdfIn PDF document text
    • http://reduslim-eu.site/reversibility_examples_in_sportvemj4.pdfIn PDF document text
    • http://steblin.pro/81840784881maqkz.pdfIn PDF document text
    • https://xebanodax.weebly.com/uploads/1/3/5/3/135382800/fuvedurasiz.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/Ujbdigy/fox_cross_stitch_patterns_kits.pdfIn PDF document text
    • http://czecheducation.space/watch_bourne_ultimatum_online_free_megavideo2yt5v.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
    • http://fedorahosted.org/lohitIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2C0 3768 bytes
SHA-256: df6df7fe6f56c1a33d440ef01eb1adabc15623fcb7f36ea3bbb6eeaf8c671d5b
font_01_sfnt_off0001b002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B002 5088 bytes
SHA-256: cda080a19f26dcf19417d27cb1b81977bd6dec6945296134af98a853d06aa7a7
font_02_sfnt_off0001c15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C15B 15032 bytes
SHA-256: d6eecca9eea5b5d5d823156c205e410794e4ba9a3f43cdb1909244796ebbbebe
font_03_sfnt_off0001f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0C5 16104 bytes
SHA-256: d96c76f5376e419817e6c204e3c8a7f093b24231da08501056136cfbd841dade
font_04_sfnt_off0002058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2058A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_05_sfnt_off00021389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21389 3236 bytes
SHA-256: 8d7e9cd01ccbb0a95d126deba0fcfd35c2fc6db7b448bb7ecfd90705a5d3d32c

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