Malicious PDF — malware analysis report

Static analysis result for SHA-256 52872b6c6399d426…

MALICIOUS

PDF

69.8 KB Created: 2021-02-14 07:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 714fc32fc50c638d5277cdabac6f40b1 SHA-1: 102fbbf2297b6e7342b420c87c8c9f4f3a07bf3a SHA-256: 52872b6c6399d426473d3b9b61a2338dedffdcc13e44a912d8dd159de76b6760
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The ML classifier strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of numerous embedded links, some pointing to suspicious domains and others part of a link farm, suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/123?utm_term=chinese+fire+drill+origin In PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/remibodegit-zawiviwasega-jedud-riwivumo.pdfIn PDF document text
    • https://temavemata.weebly.com/uploads/1/3/4/6/134611183/lebokumewefon-woxedilipamoran-pepufep-kavidoraxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5fdc79ef6c262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_6025c06087917.pdfIn PDF document text
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/388979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5ffdfe88b3038.pdfIn PDF document text
    • https://xovokemopozok.weebly.com/uploads/1/3/4/5/134579322/lunoxer-lafowuzirokub-bowesebup-jujelukoranijol.pdfIn PDF document text
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/fukogerurepa.pdfIn PDF document text
    • http://jipevuzugegusol.22web.org/ipcc_exam_date_sheet_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_5fe72fa8324a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_6015c289804e5.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/zubata/71825828671.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/chaim_potok_the_promise.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/gisor.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/bekhayali_me_video_song.pdfIn PDF document text
    • http://jasigobup.epizy.com/87253174265.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_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 4864 bytes
SHA-256: 88e0f547b05417f5b5c4508a40195db01b707ec611e1c072136dd40e2fa0ff62
font_01_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 10500 bytes
SHA-256: 8332b48098109cc861efefd827ee183c09f789da7410d124e3a0b22774383835

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