Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3150a9da86902da…

MALICIOUS

PDF

84.3 KB Created: 2021-02-11 14:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 44fcfef7a7225625055100a9283204d0 SHA-1: ab88c1d7462f91f7fef8ac5a385dda5425d7ccf6 SHA-256: e3150a9da86902da929dd34a6a998eae54a68bdd4af20427f42353940a54217c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=segmented+neutrophils+manual+low PDF link annotation
    • http://pusolaxunu.66ghz.com/resume_templates_for_mac_pages_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/jbijlhb/5204606129.pdfIn PDF document text
    • https://cdn.sqhk.co/junizafuzep/IPyhahb/very_loud_phone_ringtone_free_download.pdfIn PDF document text
    • http://suzuxef.22web.org/42247084387.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/khfhihh/88443030959.pdfIn PDF document text
    • http://drnextact.xyz/minecraft_apk_free_download_0.15.0s6xgk.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/jaURgj6/sun_mountain_2017_micro_golf_cart_gt.pdfIn PDF document text
    • http://babbieshop.ru/sexoxepumokivexamud4mip.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/advanced_calisthenicsxrt38.pdfIn PDF document text
    • http://dobanojuwelog.22web.org/82637589654.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/Uq4igIt/wifukizisipatesewir.pdfIn PDF document text
    • http://pixerofojoka.22web.org/spring_coloring_worksheets_for_preschoolers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tudigefogoxawu.rf.gd/baveboxuzuponawe.pdfIn PDF document text
    • http://futezazunup.rf.gd/play_emulator_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/asthma_exacerbation_in_pregnancy_guidelines.pdfIn PDF document text
    • http://kokidudelilusib.epizy.com/business_income_worksheet_explained.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/48394212808.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 5448 bytes
SHA-256: cb487ba2202fb79602840c8b975add0fd3dfc32027497b6fc6f23df46164138e
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 10932 bytes
SHA-256: 942b3ea5d8a37a054688d4f7038c470eb4a972a9793a0ecbc9bed4ee7a5a7b13
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61
font_03_sfnt_off00013550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13550 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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