Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b5c5a0195da981…

MALICIOUS

PDF

72.9 KB Created: 2021-04-08 08:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 662e72553ca0f236d2ee4c3ccdabe9ba SHA-1: 2e0ce8766f9b98f798c0ad1975d81441026e7162 SHA-256: a0b5c5a0195da981f024f75ad09f23c9967af1d73bd7cbc3980e735651081e10
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=exam+ref+70-483+programming+in+c%2523+2nd+edition+pdf+free+download
    • https://xegokefizu.weebly.com/uploads/1/3/5/3/135323464/921f5.pdf
    • https://bijigixeze.weebly.com/uploads/1/3/0/7/130739450/bokowodafep_lupulidas_mulej.pdf
    • http://vobigivu.22web.org/cbre_annual_report_2016.pdf
    • http://meetsalle.xyz/73543496125r4yqe.pdf
    • http://naturaitalia.space/22105956708qo1d3.pdf
    • https://cdn.sqhk.co/fujotojaxob/dihLggH/22374265326.pdf
    • http://moymagazin.xyz/32300430327ublu3.pdf
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/jisixidoko_ginirumom_vixaxo_vitiwadol.pdf
    • https://cdn.sqhk.co/dojidavos/4hhijsa/calibria_crystal_guardians_reroll_guide.pdf
    • http://webmastervlad.ru/is_indian_stock_market_open_on_christmas_dayriibe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuguvoxoki/climbing_equipment_log_template.pdf
    • http://fojeloga.rf.gd/abrsm_grade_8_piano_syllabus_2020.pdf
    • https://s3.amazonaws.com/fosawef/present_perfect_tense_exercises_with_answers_online.pdf
    • https://s3.amazonaws.com/jewizopukuni/singer_sew_mate_5400_bobbin_winding.pdf
    • http://dajajubofu.rf.gd/brill_s_encyclopedia_of_buddhism.pdf
    • https://s3.amazonaws.com/xanunafojuloki/30348780785.pdf
    • https://s3.amazonaws.com/lusegokaves/69841637110.pdf
    • http://weweladegop.rf.gd/zugusifupiwexameferusit.pdf
    • http://nupabumafe.epizy.com/google_chrome_apk_for_jio_phone.pdf
    • http://fevejalamozek.epizy.com/39953322556.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_off0000d9e4.bin
aeb8e631e2ddcfd391e934261c9a63793fceaf71e073cbc4729872db822d31e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 5852 bytes
font_01_sfnt_off0000eddd.bin
b4c273a8abe684f3c90ed7090f2d280aecce17c17a8c70c823450977866ef2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 11624 bytes

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