Malicious PDF — malware analysis report

Static analysis result for SHA-256 8364e5a9a2730354…

MALICIOUS

PDF

73.8 KB Created: 2021-03-04 07:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 24e5dfb82dc2e6d2e999634406edcd3a SHA-1: 59d265306228123d4e0c805ae1c8e6e1fd5d939d SHA-256: 8364e5a9a273035470d9602330424195984d38b1c45528bc7bc55d0ea5ac564d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

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://kuzutuzo.ru/123?utm_term=thermo+king+tripac+apu+eng+code PDF link annotation
    • http://sizuxofutitarax.mypressonline.com/jaxutitirovat.pdfIn PDF document text
    • http://astrology-personal.online/83948368677au1i6.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/giZghjh/omg_gross_slime_simulator_joke_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/jjjiohe/ririxowoda.pdfIn PDF document text
    • http://eduha.online/g-shock_mens_tough_solar_black_resin_sport_watchc04vk.pdfIn PDF document text
    • http://numulul.mygamesonline.org/biziwemabedexej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5fdb2942f1de9.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/41937773441efgxe.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/48689956765.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/daBhh4E/zombie_wallpaper_computer.pdfIn PDF document text
    • http://teenagetutor.net/3826223982238hdo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_600977adae3f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_6007e55832058.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/gemixenuxufadazefezosud.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/puroferogubix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivibepatapa.rf.gd/tekekowisufusutosesopob.pdfIn PDF document text
    • http://kesekerezox.epizy.com/10296957849.pdfIn PDF document text
    • http://pifimat.epizy.com/ocr_b_chemistry_student_book_answers.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_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 5288 bytes
SHA-256: 5ee21287487277cc9db652e75f0274c9fee4d0e464bf9215fc4af189373b2ba4
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 10300 bytes
SHA-256: 468401396ff3eb22fbb3610b05a435f6ea519d72b1572257815d1401d7a6ff8f