Malicious PDF — malware analysis report

Static analysis result for SHA-256 9382e13849cfe6c3…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 16:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 958ebe49b3bba08e2a51da731633bfe5 SHA-1: 503ff63d7fa7dcba49e75dd21304875c120f0691 SHA-256: 9382e13849cfe6c39525a7a437c88b0371ec8fd9a6e928faad57a0bef3da291a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO abuse tactic. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest the intent is to redirect users to potentially malicious content or phishing sites.

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
  • 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.
  • 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://jumiwimov.ru/award?keyword=bilirubin+metabolism+pathway+pdf PDF link annotation
    • https://cdn.sqhk.co/jasojime/jcghijf/58690279649.pdfIn PDF document text
    • http://quickstore.pro/24044785389dznqv.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/zavuzor.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/would_you_change_your_religion_to_marry_the_person_you_love.pdfIn PDF document text
    • https://cdn.sqhk.co/xexogataza/Cidjfjf/4478817252.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/vqaheji/tapavovatagusome.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/1712696.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/iaYTgiF/stars_hollow_mystic_falls.pdfIn PDF document text
    • http://fruct.space/rodovosozosijadimotezfjulk.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/w8gihf6/all_crowd_control_games.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/d7upDFP/fepofozujolizijak.pdfIn PDF document text
    • http://mavurelaro.22web.org/bhagwat_geeta_in_hindi_video_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/Xshajif/vikusubof.pdfIn PDF document text
    • https://bamopinusomuna.weebly.com/uploads/1/3/1/3/131379567/ximat.pdfIn PDF document text
    • http://moxupasasitote.mywebcommunity.org/ars_amatoria_italiano.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/kepepaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopovixiwi.epizy.com/soundcloud_er_klickaud.pdfIn PDF document text
    • http://ferodibev.onlinewebshop.net/cracking_the_dream_code_book.pdfIn PDF document text
    • http://kusotuwomaru.epizy.com/radio_button_in_html_without_form.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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 5664 bytes
SHA-256: 86b2be3407845384691017759ec53a4e31a75fea5108e92abaa12dfce7179c77
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 11584 bytes
SHA-256: 256e09699e7b798bb6b11e7d292b56688ea4ff830d9d6e243116e94cef6054b7

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