Malicious PDF — malware analysis report

Static analysis result for SHA-256 327258dca8c0ab4a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 19:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84f9ebac904927763739b674b6b45378 SHA-1: 4e235267963574c705ecd7216e674ea26fd5433f SHA-256: 327258dca8c0ab4ad10a960c735382244757dc32bb0abae34f06f3cb3961e231
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a primary suspicious URL pointing to a domain known for hosting malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a tactic to obscure malicious links. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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://botokaw.ru/wix?keyword=parts+of+a+plane+inside
    • https://cdn-cms.f-static.net/uploads/4450516/normal_5fdc496d338d2.pdf
    • https://static.s123-cdn-static.com/uploads/4385422/normal_5fc6f3b368fb3.pdf
    • https://cdn-cms.f-static.net/uploads/4469630/normal_602e858da4e47.pdf
    • http://vudasuti.mygamesonline.org/angularjsmake_example.pdf
    • https://cdn-cms.f-static.net/uploads/4474992/normal_604b809148888.pdf
    • https://cdn-cms.f-static.net/uploads/4392470/normal_6024824b4a154.pdf
    • http://waparudadip.mywebcommunity.org/agile_methodology_in_testing.pdf
    • http://lorubuxetorifa.medianewsonline.com/paulo_coelho_libros_el_peregrino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lijopavexanuse/ato_guide_to_capital_gains_tax_2011.pdf
    • http://sadoboxijowem.myartsonline.com/70486840650.pdf
    • https://s3.amazonaws.com/putelekireza/5114370392.pdf
    • https://s3.amazonaws.com/memexelu/fimapozazusuromenanatosaf.pdf
    • https://s3.amazonaws.com/dogevazapiwediw/configurer_adresse_mail_bbox_sur_android.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/33756379990.pdf
    • https://s3.amazonaws.com/zalomi/blue_eyes_hd_song_free.pdf
    • http://tupesom.atwebpages.com/by_the_time_you_read_this_i_ll_be_dead.pdf
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_0e720089d1a447209f5e02814aea60e5.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_f3ea5fa613cf4893b14fafdb00a032c8.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc1.bin
565e250b60754f0b1b47a3cf9c806c5bfae3572d51737ab5b393f928242716ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 5036 bytes
font_01_sfnt_off0000fdef.bin
47e848e7d03aa1af370a6a925009267ededd0f81746d7df634e32a3736969b3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 11036 bytes

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