Malicious PDF — malware analysis report

Static analysis result for SHA-256 a672c7c2b785fbbe…

MALICIOUS

PDF

153.5 KB Created: 2021-03-02 02:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9f476a98e18fd7c9bb3a347e569f831f SHA-1: 0a69c5a8388dc7d0a7aa6fa0434e83c6d579d734 SHA-256: a672c7c2b785fbbe1380478954c2e4462a9e1e9b5e3a7e7ca2250e69229ea1a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically disguised as a search result for a technical query. This URL redirects to a malicious domain, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a malicious site or download further malware.

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://baarspo.ru/strik?utm_term=how+do+you+forward+calls+on+a+nortel+networks+phone PDF link annotation
    • https://cdn.sqhk.co/lilaxikixo/sgcHSha/61855459179.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/how_to_open_paint_using_run.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_602979e086a21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5fef454849166.pdfIn PDF document text
    • http://ctuxuu.com/exercice_son_in_ain_ein_ce26hn0l.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/flXGwif/sivigedala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_6029940820ed7.pdfIn PDF document text
    • http://mon-cmbretagne.best/tomegadekovujosutomindsinu.pdfIn PDF document text
    • http://desokob.22web.org/when_will_jojo_part_7_come_out.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/gcIgjD1/zomojaxerogumumupifada.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/e2zijI7/math_arcade_chromecast_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491705/normal_5fe947b4a59e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5fca2a10d2df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_60394fc077ba7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekujekodabudu.epizy.com/istanbul_metro_map_2018.pdfIn PDF document text
    • http://xuvafinuvewabek.epizy.com/jotujovirakibow.pdfIn PDF document text
    • http://kanusilos.epizy.com/53567870423.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_off00021aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21AA9 5464 bytes
SHA-256: 8de18ee6d8fcc1171799ef5747cdbf4b64056907faa4974f5f324551cdc3d076
font_01_sfnt_off00022d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D53 13304 bytes
SHA-256: 7db5459ef59066affa0a2b5d72804a64267628beb76bed3ccafe0c1b6e48b457

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