Malicious PDF — malware analysis report

Static analysis result for SHA-256 5345d53a52620fd6…

MALICIOUS

PDF

79.9 KB Created: 2021-04-20 17:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7808bf4475f096ff7891c6fbe89e8852 SHA-1: 78787f361190b0cde0d3a5962275054dd96c10c3 SHA-256: 5345d53a52620fd67520906fff6ebae477b511fae8c321096b5376bdd41708ff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious sites, likely for credential harvesting or malware delivery.

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://jumiwimov.ru/strik?utm_term=que+significa+ser+pobre+en+espiritu
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/bajiramizixiwim.pdf
    • http://bitawulam.iblogger.org/ethical_principles_in_accounting.pdf
    • http://policyhelpcenter.com/the_big_bang_theory_theme_song_full_downloadysfxl.pdf
    • https://wesobopaforok.weebly.com/uploads/1/3/5/3/135311180/3778946.pdf
    • http://zazorin.scienceontheweb.net/big_5_personality_test_short_version.pdf
    • http://liketsven.xyz/pubilenojanakelasanevudotkfr1y.pdf
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/zowedesenikipiwad.pdf
    • https://bidemujoniju.weebly.com/uploads/1/3/1/8/131856381/81ed6d49a04f.pdf
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/20198d2a2440fb0.pdf
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/devawezesija-pakexijeg-fosesalijozonej.pdf
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/jolagi_jurotipe_zizupomemapiw_gusesatuwig.pdf
    • http://xufelaketodo.getenjoyment.net/fabukaxenoso.pdf
    • http://naturebiolog.fun/what_is_the_meaning_and_example_of_literary_nonfictionnzcq4.pdf
    • http://help-copyrighteamservice.com/32526725963tww8c.pdf
    • http://skout.tech/devotions_for_dating_couples_to_do_togetherup6e3.pdf
    • http://vogudikomi.getenjoyment.net/towuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bixozebaxikapos.atwebpages.com/besobuwamosadijuzelodi.pdf
    • http://fitagijup.epizy.com/88143691869.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f837.bin
21927bebc355827acc2dbca98a30638e09246f1c7cd1b03c1bc0a7965290b9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 5352 bytes
font_01_sfnt_off00010a7f.bin
2ff6edbce85692b43975a0952023b083dfb8e527836d34f207163037f7f9c1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 11916 bytes

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