Malicious PDF — malware analysis report

Static analysis result for SHA-256 757cbf289a1c950e…

MALICIOUS

PDF

79.0 KB Created: 2021-04-24 11:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 542e52ed513145862c9ff60043fa7802 SHA-1: 738da6b542045ff8f3e11585ee59767ec7c720e6 SHA-256: 757cbf289a1c950e4e34aa003ffe89288b631b85bd81f353f0057735dec24ea8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs pointing to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document functions as a link farm, likely to distribute phishing content or malware. While no scripts were explicitly extracted, the presence of external URIs and the link farm nature strongly suggest an intent to redirect users to malicious sites.

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://gimoguvi.ru/strik?utm_term=are+the+forged+in+fire+knives+any+good PDF link annotation
    • http://pawomodom.medianewsonline.com/texuku.pdfIn PDF document text
    • http://rent-nout.site/vatadunijukonedanufusupod73vne.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458148/normal_5fff0e0f4e5b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff3685991662.pdfIn PDF document text
    • http://sopidemeleket.mygamesonline.org/89690536103.pdfIn PDF document text
    • http://startask.ru/pirubenitezexaffsptp.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/tusenapisedelilotijupaj.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/how_to_work_lathe_machine.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/nkjv_bible.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_605967ff62028.pdfIn PDF document text
    • http://private-channel.site/rajatusutogatumovolatizaov59x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477623/normal_5ff64a51e9711.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/virufu.pdfIn PDF document text
    • http://detonic-buy.website/sowolopesastvpt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_605465342b34a.pdfIn PDF document text
    • http://pressit.fun/how_to_help_someone_who_is_stressedzv63n.pdfIn PDF document text
    • http://1freedom.space/47661300220wfgd8.pdfIn PDF document text
    • http://pogekoxuw.mygamesonline.org/allen_neet_biology_notes_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f135ae8f-e81f-4423-9f26-1e1ea9920af3/dotoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e916666-5b28-4725-bff9-3af9b26ebec7/woxanofokulilinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9454ff8d-c638-4c80-ac9e-2089b9590881/romeo_juliet_taylor_swift_lyrics.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_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 5352 bytes
SHA-256: ffd29a3720531edd25c3043e5f44687832ac6546976c5f3c4bf33725b58acbbc
font_01_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 10712 bytes
SHA-256: 96dec2a703cdf51b1b5805e5719994ac5388c7bfb5de6b1113b92d95c3a57c90

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