Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5eb803e17f5f010…

MALICIOUS

PDF

67.9 KB Created: 2021-02-08 02:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cc31bca0b1f863cbb044097468c1ddb0 SHA-1: 20d0f5c59a02a0ee336e3f4a3738b7b2b6f07fe4 SHA-256: e5eb803e17f5f010c7dab9beb375b0ccafa5a7c3657e6f3891e1d627566fe7cb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable or suspicious domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious document designed to redirect users to potentially harmful content.

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://druttle.ru/wb?keyword=java%20runtime%20jre%2064%20bit PDF link annotation
    • https://ximipozatapemo.weebly.com/uploads/1/3/5/2/135297631/kofupux-kutirimisozaz-ginig-lakigaputobup.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/G5ibNLs/crunchyroll_premium_plus_vs_mega_fan.pdfIn PDF document text
    • http://fubozibir.iblogger.org/anti_d_guidelines_in_pregnancy.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/eMihojg/fancode_cricket_scores_watch_bundesliga_live_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/dLhajbr/vitupupuwexasawuwurovexo.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/hicijjg/lugorukif.pdfIn PDF document text
    • https://fugogifozu.weebly.com/uploads/1/3/4/8/134888696/femuborozed.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/gjRUTiu/piano_online_free_game.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/kofaxi.pdfIn PDF document text
    • https://joriwonakogilul.weebly.com/uploads/1/3/5/3/135305945/vezebo_rojujutogoj_pufirulubam.pdfIn PDF document text
    • https://cdn.sqhk.co/miranilu/Ojetjdw/the_chosen_casting_call_season_2.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jf2ifvY/download_invasion_modern_empire_apk.pdfIn PDF document text
    • http://wititabeg.22web.org/lemek.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/warapagefasovi/97688034175.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/ansible_tower_free.pdfIn PDF document text
    • http://suzusufiwavel.rf.gd/pilegumexebadosakuwiwep.pdfIn PDF document text
    • http://tujefozumuresul.epizy.com/inhaler_holder_template.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/nadifajisakaborar.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/divobupalujugikuf.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_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 5128 bytes
SHA-256: 3419cf28b2f3aeac5e53dcdc61f45889379581ad7125d2600a579fa50f21ca65
font_01_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 11300 bytes
SHA-256: 5d65794273b9cc6ae7876614b191bbba80e4c4eb5b22c4a9343b98604420010f

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