Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c160c7eb2ffbac…

MALICIOUS

PDF

72.4 KB Created: 2021-03-15 21:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 15c85e84daa7d33eb70f875b949c77bd SHA-1: 10c15c43de9d0a4fa8b7248ab10298736058937e SHA-256: 93c160c7eb2ffbac8bf9249b6cfe2699cb96551646e15f843c074a3a6b99fdf8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://crophysi.ru/award?keyword=fungal+colony+morphology+pdf PDF link annotation
    • http://dream-stat.ru/ipod_touch_4th_generation_change_batteryfoe94.pdfIn PDF document text
    • http://liketime.online/audacity_software_for_androidru4bn.pdfIn PDF document text
    • http://somubuzesixuwun.getenjoyment.net/kinufuje.pdfIn PDF document text
    • http://dixunawizodel.iblogger.org/rbi_guidelines_for_collateral_free_loans.pdfIn PDF document text
    • http://genusadnlo.space/260_rem_140_berger_load_data8f36h.pdfIn PDF document text
    • http://afracheat5.xyz/970330798267e806.pdfIn PDF document text
    • http://agencymedia-ig.com/velocity_and_acceleration_worksheet_cstephenmurraykht8w.pdfIn PDF document text
    • http://rorogudadusosej.getenjoyment.net/architectural_working_drawing_examples.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/ganuraxibowidonozij.pdfIn PDF document text
    • http://kzrovk.xyz/traffic_road_game_onlinejkpum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenasaxoxaxober.rf.gd/login_template_php_mysql.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/8262195363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af60e07e-ac1f-4217-b5ad-20bccad69169/dovazovuwosov.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/68862089939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cf0751-7614-4c1a-8a7f-b718fda98b57/godumojejuxipole.pdfIn PDF document text
    • http://xenivut.epizy.com/vibefogegodexumudas.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/74621852082.pdfIn PDF document text
    • http://vumazudu.rf.gd/arp-_scan_for_windows_7.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 5448 bytes
SHA-256: fc1704d4107e54c9ea1452d13f04a9d7c1766819fccffa2379db1e800e2872a5
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 10852 bytes
SHA-256: fbcf5916180af62044f00bb465e6922ce88e5ff109cc92ee55e4ee3a83c7274e

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