Malicious PDF — malware analysis report

Static analysis result for SHA-256 3831079ddc75b48c…

MALICIOUS

PDF

70.3 KB Created: 2021-02-13 15:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 14f1b0f6524e638a7ca780b2ebe7827c SHA-1: 398d5e70961f8de3f8d93d6247c386b941679380 SHA-256: 3831079ddc75b48cf70c337fa7ad0c8e6b007611e985ad3ffe151eb3eeb1ec08
196 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=periodic%20table%20elements%201-%2020%20worksheet PDF link annotation
    • http://pristav.pro/4590189425806673.pdfIn PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/53d4b9c.pdfIn PDF document text
    • http://sunny-web.ru/tusomuvedunubufutdhc5h.pdfIn PDF document text
    • http://sevixewevutan.22web.org/tamasha_full_movie_480p_bluray.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/8956334.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/ciddifB/dudenixitivota.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/mhjuibt/mystic_messenger_707_chat_times.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/djbOgdC/3698011956.pdfIn PDF document text
    • http://vnds-v.website/folding_knife_template8qtyy.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/busutafitufe/vuvepuzaponekiga.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/fadodisob.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/39802435399.pdfIn PDF document text
    • http://rapuxatidugek.epizy.com/ten_point_plan_zimbabwe.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/lopebiwesaguzani.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/lamezuwaravolujuned.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/axially_loaded_members_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/20662156785.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/authority_signatory_letter_format_for_gst.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_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 5832 bytes
SHA-256: 9db2705b5b5f9f11a8ae8f1760348215ced822242a272d1f8dca99ea6e1fbc32
font_01_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 10444 bytes
SHA-256: 9b939ea526328fc923136c2ed8517b76783390468f1034d293aedd3556251f03

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