Malicious PDF — malware analysis report

Static analysis result for SHA-256 2088ef71dce8fab7…

MALICIOUS

PDF

90.7 KB Created: 2021-03-23 01:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e390146aa6992fa04ac70fa78a57a83b SHA-1: bcc682ce05440ab9f2307e5796b201a7cb9b22ff SHA-256: 2088ef71dce8fab7803842cf9bdc7905fcf8881287b432f48da1078b7a18f9dc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=define+administrative+law+pdf PDF link annotation
    • http://zefabupinakodul.22web.org/84168091586.pdfIn PDF document text
    • http://movawugutel.22web.org/rationality_assumption_in_economics.pdfIn PDF document text
    • http://megiloreb.mypressonline.com/86532812053.pdfIn PDF document text
    • http://dujufevotudamo.iblogger.org/how_to_read_and_understand_industrial_electrical_schematics.pdfIn PDF document text
    • http://youtube-subscribes.com/birutovaruwimo16p1m.pdfIn PDF document text
    • http://myfoxing.online/947371214885jfj7.pdfIn PDF document text
    • http://wumakelanatug.22web.org/how_to_tie_the_knot_at_a_wedding.pdfIn PDF document text
    • http://litamomun.22web.org/73415193515.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://veraliw.rf.gd/d11_calendar_2020_19.pdfIn PDF document text
    • http://wenares.myartsonline.com/curse_of_strahd_starting_level_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2288a312-d4a3-4460-8423-e7578443c138/57213131588.pdfIn PDF document text
    • http://xixovunutev.epizy.com/manitoba_provincial_election_2019_party_platforms.pdfIn PDF document text
    • http://kelopemajidimux.epizy.com/como_hacer_una_propuesta_pedagogica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04938e7c-7a33-4754-8d66-f5e4fe2dfc1b/cozi_tv_new_schedule_january_2020.pdfIn PDF document text
    • http://rexivire.epizy.com/zononobafopupulabad.pdfIn PDF document text
    • http://zimipasazodid.rf.gd/53388960043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c293b3-1825-4cd6-a08f-583b161113ba/sikifu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 5016 bytes
SHA-256: 2f3a559da5f574cc503cd0013541df2bf32e9aa3cb4992f0ddab220fce85d64e
font_01_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 11144 bytes
SHA-256: 9ce7b7a268c74f9704672a5f350e477cb37c527c29a4af60e3f7b593495bf059
font_02_sfnt_off00014fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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