Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2b9aeee88cfa4e…

MALICIOUS

PDF

77.5 KB Created: 2021-03-30 21:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e3f0d71cde8aca5b9ceceb251f09cae SHA-1: daa4e5d2970e60c465980e29b924b8e2298cc160 SHA-256: 2e2b9aeee88cfa4eb33528a30dd8906c6dfa5e136dd39417eeb3b233c8032762
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

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://botokaw.ru/123?utm_term=vocational+english+for+nursing+pdf
    • http://nitesufi.sportsontheweb.net/pdf_to_word_converter_software_for_windows_10.pdf
    • http://xuvaxujogilo.mygamesonline.org/blood_pressure_chart_age_wise.pdf
    • https://static.s123-cdn-static.com/uploads/4449411/normal_5fe58070a9880.pdf
    • https://cdn.sqhk.co/nojumuku/2ifnVMa/rummikub_replacing_joker_rules.pdf
    • https://cdn.sqhk.co/pivokazi/n11kigy/14429748002.pdf
    • https://cdn.sqhk.co/kokowoxiwi/ejigipa/43804413343.pdf
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd63602617b3.pdf
    • https://cdn.sqhk.co/valujoper/jeThjib/66059381746.pdf
    • https://cdn.sqhk.co/jupuvonijor/WhaSghe/lozef.pdf
    • https://cdn-cms.f-static.net/uploads/4402956/normal_60594e29882e4.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5fe8f599b0e91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mukovixajetunex.epizy.com/best_flirting_apps_for_iphone.pdf
    • http://kogosiji.epizy.com/xoxudatalovedix.pdf
    • http://tazefuwavubu.rf.gd/gobusejez.pdf
    • http://dowafirowelumex.atwebpages.com/76033117255.pdf
    • http://vubenotabajumem.epizy.com/41428896647.pdf
    • http://kuwerejexamifug.epizy.com/what_are_the_4_basic_elements_in_little_alchemy_2.pdf
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_2dfed64cae294a76b2a6464841ea112a.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_4ad7fd4af7f443f8abb8a06a0261ca97.pdf?index=true
    • 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_off0000f18c.bin
ea57bf485185bd392d944ea756d2fd91e12c18701beb2af790e0498a1fc84d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 5384 bytes
font_01_sfnt_off000103dc.bin
432d20635bf432a49f5f9b66443af8af4e602f82cd2bb17212ec3697c57e2ab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10844 bytes

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