Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2945e9e7ac2b20…

MALICIOUS

PDF

77.8 KB Created: 2021-02-23 17:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b75d7523aca7f29deb1017a88eddcde2 SHA-1: 293ea4aca6df053e9df7f16bb431494f6c2a6a6c SHA-256: ac2945e9e7ac2b2062a2369b3abb325de83b5941ccb61c464ced62e21cab24fe
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 0.9998

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://jottigo.ru/wix?keyword=integrating+quotes+worksheet PDF link annotation
    • http://sobanurosu.22web.org/88755299827.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/2cihE0r/catan_dice_roller_cities_and_knights.pdfIn PDF document text
    • http://zarabotok.space/dabbe_cin_arpmas_indir_full7r6uv.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/aHaHsvc/how_to_check_your_kplc_bill_via_email.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/jgggjhh/bezas.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/ctWhigi/relagisu.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/ehhig1e/lipesikelizamamed.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/hbijiPf/riguvirif.pdfIn PDF document text
    • http://prizinsta.info/sebuviwut217vd.pdfIn PDF document text
    • http://quickstore.pro/gps_garmin_64s_vs_64x9tsbm.pdfIn PDF document text
    • https://cdn.sqhk.co/tegasipitif/bLdigsj/letenozap.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/FgdzmoT/xojiguwezel.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/iit0Yju/17098930614.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://vojamul.epizy.com/adobe_reader_for_android.pdfIn PDF document text
    • http://nabiporemug.epizy.com/bhagavathi_amman_video_song.pdfIn PDF document text
    • http://batefagut.epizy.com/jaluj.pdfIn PDF document text
    • http://pejibuturu.epizy.com/disubanudovekikexu.pdfIn PDF document text
    • http://rexalovujomorox.epizy.com/iap_thalassemia_guidelines.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/the_haunted_hill_house_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 5016 bytes
SHA-256: c7c119b25feb6b2ffc9fd507da1aab25c9e962a41cdacc6628a1c8988fd5fb64
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 11464 bytes
SHA-256: 84197a8fc73869821dac20471e8ec36504ff29497e97642d338b5b7a6a60e127
font_02_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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