Malicious PDF — malware analysis report

Static analysis result for SHA-256 d090120030ef1491…

MALICIOUS

PDF

87.7 KB Created: 2021-04-16 02:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 51fd23fc15edf2f8b702846be00a38ae SHA-1: 688d0770a98f3f2ee02906c50a2513ef876bf93c SHA-256: d090120030ef14911db8cf56dba4ba6bd5883056de959943a96f0b599c7143d6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=free+advanced+english+speaking+course+online PDF link annotation
    • https://cdn.sqhk.co/fupokonabat/cidjbgg/piggy_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/ghjfhaA/lusunu.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/xXjgghw/48981604213.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/hdr4hjF/contract_killer_2_mod_apk_rexdl.pdfIn PDF document text
    • http://buvofigutunam.22web.org/paying_a_charge_off_on_credit_report.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/RdihXji/brawl_stars_star_park_theme.pdfIn PDF document text
    • http://gezakiribonenin.mywebcommunity.org/vinafosedibisote.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/46311543345.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/vesadim.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/canon_lide_110_scanner_driver_for_windows_7.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/desain_pembelajaran_addie.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/siaPSic/rajasthan_defence_academy_jaipur_fee_structure.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/jdzibRP/furniture_design_jobs_chicago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/how_to_say_please_in_french_formally.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/sahih_bukhari_hadith_arabic.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/strona_czynna_i_bierna_angielski_wiczenia.pdfIn PDF document text
    • http://sajatuvireguta.atwebpages.com/vugofapuxavul.pdfIn PDF document text
    • http://nilidax.epizy.com/ragebisexi.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/tudixovidevusa.pdfIn PDF document text
    • http://gudujezakolomu.onlinewebshop.net/25375402674.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/wipemixupunotorivovisoj.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/nabigiwawobobamigezezi.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_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 5412 bytes
SHA-256: e69cd5dd4cc367f6b0dee281d68c31061131538e1ea9f53aa0e26305ac04d58b
font_01_sfnt_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 11276 bytes
SHA-256: 97d5d8d07bd7607caa8a2914dc76a4065654ed1ab6768184ca3d220520a45ac8
font_02_sfnt_off00013c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C86 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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