Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83d442e68874af2…

MALICIOUS

PDF

71.2 KB Created: 2021-03-27 14:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f8f12b20c49d11809d80059d87475206 SHA-1: b11148696a77b1ba4220ab21a457027aab9aa317 SHA-256: e83d442e68874af287c0e443010a644f76b249abc17ab513706a1c94b95b4eea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host a large number of links. No scripts were extracted, but the overall structure and URL distribution point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=cambridge+learner+s+dictionary+english+turkish+pdf PDF link annotation
    • https://cdn.sqhk.co/sobexofap/icXiahe/droid_cleaner_optimizer_pro_2._2._2_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462059/normal_5fed600cd85ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490542/normal_6000b14ebd7fe.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/cSibP6f/mazie_hirono_phone_number.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/edit_text_online_free_without_watermark.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/betojegomazepelixitumig.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/ihLyDmy/can_you_escape_tower_level_6_walkthrough.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/what_are_two_characteristics_of_figures_in_ancient_egyptian_sculpture.pdfIn PDF document text
    • http://newutatokulu.getenjoyment.net/las_28_creencias_adventistas_para_jovenes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_60511c4ee8644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465905/normal_601589d14a714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_60557e4be02ab.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/breakfast_at_tiffany_s_truman_capote_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374839/normal_5ffa01654b6e2.pdfIn PDF document text
    • http://checkmycredit.info/shadows_of_brimstone_adventure_book_downloadwqd6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491945/normal_6011fc04e2798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5fe2e0f0b3649.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/podamiduwenokesojepemis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_603bb1bbd8d38.pdfIn PDF document text
    • http://sarhello.online/51197994363pa23i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefuwaw.atwebpages.com/jakotixomivareg.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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 5780 bytes
SHA-256: a6ee5ae5d6b1a211ef47d30c51149de9349e5c0ccd4e47f01c2397d8a0f389cc
font_01_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 10968 bytes
SHA-256: e9cf197be0651664ed278cf75b30b9246db94276b7b43d043ee63a49a341f1e3

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