Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a4cb52ad713ae5…

MALICIOUS

PDF

76.1 KB Created: 2021-04-01 14:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 588b31060a58af53ba021cbc5cc956a2 SHA-1: 53e77c9f0ff105f9dd4aa70317de9e24226d71ca SHA-256: d5a4cb52ad713ae5fcab9a6f9e70fec608f9ec103f513397fd8340758112143e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://xezojetit.ru/wix?keyword=chegg+ebook+to+pdf+mac PDF link annotation
    • https://xuvodovujekezoz.weebly.com/uploads/1/3/5/9/135957716/jilusikewemanik.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/icbngfW/39666185294.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/ejfhcWk/77377183826.pdfIn PDF document text
    • https://cdn.sqhk.co/rokunufoleti/age9Rgf/sovukizitasupuxexome.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/fhihcif/the_white_door_achievements_sarah.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/Wpghib7/cabify_argentina_reviews.pdfIn PDF document text
    • https://tafifomoku.weebly.com/uploads/1/3/1/8/131856516/1fd0c9c966c9c.pdfIn PDF document text
    • https://rapekazojeroxe.weebly.com/uploads/1/3/4/6/134697974/xufetujusipow.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/wifhf8F/warlings_armageddon_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/hieBjgx/download_apk_poker_offline_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/TggYigl/bein_sports_channel_cox.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/8gfiajc/xovavafodilizopumigigafoz.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/61248.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/nijosinizo/delete_app_search_history_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/dj_audio_songs_free_telugu.pdfIn PDF document text
    • http://kifemulawej.epizy.com/nufutetiguzunukovapevojow.pdfIn PDF document text
    • http://litopuputorer.rf.gd/cambridge_primary_curriculum.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/rupezuzuke.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 5372 bytes
SHA-256: f16f51ac4856b7df97964f5d0712b460a80044ecb0eb7a4dbac28b20a82e7740
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 12152 bytes
SHA-256: ce9c28744207a54a5c573bac1301f6069eb0b4e3410e4a81614aafd085d679b9

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