Malicious PDF — malware analysis report

Static analysis result for SHA-256 2761d2893191a366…

MALICIOUS

PDF

70.1 KB Created: 2021-03-06 01:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bbfd2c0080809a622ecbb798785b3abf SHA-1: a58d2e12fe59976cd74c28a88141fab0f0bd3b48 SHA-256: 2761d2893191a3669006c8ead2517bbf010ec05b29e439a6ffe57f9f676aacf1
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://mezovuduw.ru/wix?keyword=all+students+take+calculus+explained PDF link annotation
    • http://gachihyper.xyz/moketis9wt15.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/i9Ajdif/prank_sound_box.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/Ghhiaia/recarga_nauta_wifi_en_cuballama.pdfIn PDF document text
    • http://kostlike.site/bifamadagolafefomirvfuc.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/43310255411.pdfIn PDF document text
    • http://nigufuf.iblogger.org/cookie_cutter_shark_information.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/69216341744.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/introduction_to_thermal_and_fluids_engineering_chapter_15.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/kisagoz/xodaruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67417e26-a55e-4cbf-9023-5e38ee9e6c8f/how_to_fix_fuzzy_brain.pdfIn PDF document text
    • http://wuxekijonudi.epizy.com/43547233207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe96742-490f-469a-9ab8-4716b1a9473e/lexoduvutowezokoreduxumux.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/st_benedicts_college_colchester_uniform.pdfIn PDF document text
    • http://tujulerika.epizy.com/can_a_nissan_pathfinder_pull_a_horse_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33954aab-4ae1-4fa6-9982-9a38e089c7b4/is_3950x_worth_it_over_3900x.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/gofegenenivij.pdfIn PDF document text
    • http://tinosizifaxuful.epizy.com/l_t_housing_finance_annual_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/90230553937.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_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 5092 bytes
SHA-256: c3530bc93b9886c2e4bbb015ca527dcae2d6c73ff3d6c930bdd0bb684edf930d
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 10396 bytes
SHA-256: bf508cd9f35e879c8487bac887f09ce3bd2db46330641b77ff61080f71a83092