Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91e45de48c032e4…

MALICIOUS

PDF

71.8 KB Created: 2021-03-29 06:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fd97f4d91b30eb907143be5d564f845c SHA-1: 205a9ac57860dad025dd40d3be26bf3236c2b878 SHA-256: c91e45de48c032e443a7faee0d703a46139751b5fa45addb1d227d42b9c32c62
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content.

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://seumenha.ru/aws?utm_term=handpunch+3000+add+employee PDF link annotation
    • http://eurozone.pro/who_can_solve_a_rubiks_cube_the_fastestqny8i.pdfIn PDF document text
    • http://myyshooop224.site/yakuza_kiwami_all_substories_guidejwzhd.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/Q7Fgfjc/80538030072.pdfIn PDF document text
    • https://cdn.sqhk.co/wexazaruko/fibfcjd/nibinosekoguvutobawul.pdfIn PDF document text
    • https://cdn.sqhk.co/zumovinej/auKiejf/lucius_the_eternal_datasheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_6056bacbaa7bd.pdfIn PDF document text
    • http://begdas.fun/ma_driving_license_permita2yt0.pdfIn PDF document text
    • http://4kuhd.me/mystic_messenger_707_route_day_6d794c.pdfIn PDF document text
    • http://businessoutsourcing.info/30422362030jglsb.pdfIn PDF document text
    • http://uscarinsurance.info/batorilipiwupgc2as.pdfIn PDF document text
    • https://cdn.sqhk.co/mugodetutag/fjgFhiy/hitman_golden_handshake_van_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_60175e5799ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_601716bea9482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_030037fcfafa44798711361a5047356a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popilo/47099800652.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_d88d381a307f44f287fd61aba094eab3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamuriza/gowikazaterolapawi.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_a74b9bb36c5741b08f278ab78f360ba9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/2722817486.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/osrs_brutal_black_dragon_guide_2019.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_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 5408 bytes
SHA-256: f1176a53245dc2d46e08d4309a937530e7b17e1dfd89d5dd0ab8e555f6db06f9
font_01_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 11204 bytes
SHA-256: c96a330129f514bfb9d7ce79444ded15548c2854461341f0c511507c6bf51aa1

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