Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dc13d58c7e3aed…

MALICIOUS

PDF

80.7 KB Created: 2021-02-25 10:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2b8d6b9e39189a94434220a908f4af21 SHA-1: 67f7917aebca87ccd32b9f4333c94d9129695208 SHA-256: 43dc13d58c7e3aedaf94c1609dd22395025ae260ad7af5662b038ebb780b0d5a
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of a malformed exploit stream and ML classifier flagging indicates malicious intent, likely to trick users into downloading further malicious content or visiting phishing sites. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://druttle.ru/strik?utm_term=vst+roland+xp+80+download PDF link annotation
    • http://gedadekenoz.mywebcommunity.org/romeo_and_juliet_movie_1996_mercutio.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/axis_360_login_irving_libraryilojq.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/finale_becca_fitzpatrick_summary.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/one_night_at_call_center_full_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/Jb7W8jb/occupational_health_nurse_practitioner.pdfIn PDF document text
    • http://sell-toclick.online/witcher_3_following_the_thread_choicescs53z.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/dhghcgf/86773965265.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/basic_english_worksheets_for_spanish_speakers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotekewebi.rf.gd/pupivonajunaraki.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/kenofatudezakomesuk.pdfIn PDF document text
    • http://gikunipif.epizy.com/96682327477.pdfIn PDF document text
    • http://gagonunanu.epizy.com/vemodegu.pdfIn PDF document text
    • http://dowirimidezifa.rf.gd/battery_percentage_android_pie.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/2601861583.pdfIn PDF document text
    • http://zevazunepig.rf.gd/85519422928.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 5416 bytes
SHA-256: 92e8698cc0948bba52b61dbea2dc356a450ed4096625b98d01be3caf6f193ab2
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 10996 bytes
SHA-256: 8e30b9b7c7cfd77f6c12211cc1edfb7eccd5238f19516800a165bc5594ce480c
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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