Malicious PDF — malware analysis report

Static analysis result for SHA-256 572f6b55a7b42edb…

MALICIOUS

PDF

78.3 KB Created: 2021-04-15 22:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a14c49b39de6314a82ccf7612a9e4c2c SHA-1: 7f8ea757e6c69c981cf6d794b653dfebaf62d183 SHA-256: 572f6b55a7b42edb854559077ec2a6d571446045bab166b652f19f309a4d2eb3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary external URL points to 'https://seumenha.ru/strik?utm_term=python+for+loop+range+of+numbers', suggesting a lure to a malicious site. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', reinforcing its malicious nature. The presence of embedded URLs and the ML classifier's high confidence score further support the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=python+for+loop+range+of+numbers
    • http://pofuxubilet.sportsontheweb.net/nazagevojaset.pdf
    • https://cdn.sqhk.co/wepurodapike/W9yCieF/inside_out_characters_anger_costume.pdf
    • https://cdn-cms.f-static.net/uploads/4464056/normal_602be615d093b.pdf
    • https://cdn-cms.f-static.net/uploads/4502178/normal_5fd9695b67cb2.pdf
    • https://cdn.sqhk.co/kopilixa/bX6hdic/97451947196.pdf
    • http://wdd13.ru/canada._ca_ei_internet_reporting_loginqixod.pdf
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/1362005.pdf
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/wazirikakojawevibe.pdf
    • https://cdn.sqhk.co/divoxisig/idiiha3/anger_of_stick_4_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4381105/normal_605dc36eacb24.pdf
    • https://zodosixuwe.weebly.com/uploads/1/3/4/8/134863902/rokuxazug.pdf
    • https://cdn.sqhk.co/mozozezowos/ZgjhaLZ/beat_the_boss_4_throw_5_fireworks.pdf
    • https://static.s123-cdn-static.com/uploads/4387918/normal_5ffd7fca21ead.pdf
    • https://penoruzeni.weebly.com/uploads/1/3/4/1/134132400/fotovawuwujigoziz.pdf
    • https://cdn.sqhk.co/dijogiper/chfJPWA/bare_knuckle_boxing_daytona_beach.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vodukatova.epizy.com/sexurodofalujoteduvera.pdf
    • http://melaworogafema.epizy.com/tusefamatagu.pdf
    • http://vudukuk.rf.gd/jobojofupasugitota.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58a.bin
b50f5405cc6d314ba8c07c3a36ad12b1153420129110ee8c025549c6f41f1a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 5392 bytes
font_01_sfnt_off0000f7ae.bin
7e79d2b11ca143c1d4162e6a72422593380901294a977c3dc18c89e520e2b1cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 11192 bytes
font_02_sfnt_off00011df9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 4324 bytes

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