Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac156b05074624a…

MALICIOUS

PDF

89.1 KB Created: 2021-03-24 03:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa291af6a336a6be5cd0c456f23b3f9b SHA-1: 11f85f27e2fdc7b551a9a9e2673d9df6542fd79f SHA-256: 7ac156b05074624aa6a4d611ca3c5a053fee15defb017b735f43d494369e228e
126 Risk Score

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, with a primary focus on redirecting users to external sites, including 'zajinet.ru' and 'medianewsonline.com', under the guise of providing information related to 'carnatic music theory books in tamil pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of disposable domains for hosting malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/award?keyword=carnatic+music+theory+books+in+tamil+pdf
    • http://luloxijemise.medianewsonline.com/tumotufatol.pdf
    • https://cdn.sqhk.co/jivobukafon/jiXBpuD/ullu_bribe_all_episodes.pdf
    • https://cdn.sqhk.co/pofoxubo/hbidBhh/ielts_listening_test_format.pdf
    • http://fevajubinijexaz.iblogger.org/kenmore_gas_stove_manual.pdf
    • http://f13x.xyz/skywalker_trampoline_15_round_replacement_frame_parts_top_tubeoho0t.pdf
    • http://esclub.pro/pro_pinball_timeshock_ultra_edition_apkf1m2d.pdf
    • http://kostlike.site/cold_chisel_songs_freehgj7z.pdf
    • http://togurebuk.66ghz.com/synonym_and_antonym_worksheets_4th_grade.pdf
    • http://world-wild-shop.com/is_the_any_news_paper_today_in_malayalam59xmb.pdf
    • https://cdn.sqhk.co/mumaxeje/fgdjfig/zewuwegil.pdf
    • https://cdn.sqhk.co/zaliroded/djggiia/talking_kitty_cats_youtube.pdf
    • http://subikizivuwen.22web.org/what_is_the_safest_baby_crib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://fowimifefezujo.myartsonline.com/vagabat_gita_bengali.pdf
    • http://kalogoraretupo.epizy.com/artificial_intelligence_2020.pdf
    • http://lagadasisipas.rf.gd/tamil_dj_remix_album_songs.pdf
    • https://s3.amazonaws.com/legipalofi/65855195512.pdf
    • http://gagujejadozudor.rf.gd/6638069188.pdf
    • https://s3.amazonaws.com/jirebonudur/wimefisodulusisisafurave.pdf
    • http://kigetivizaru.epizy.com/53473975001.pdf
    • http://nulidofa.rf.gd/answer_in_genesis_uk.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb22.bin
05bfa124a60b25230c113b92e90b6f46cf31d028a260b09fbbd110e763fee11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 5608 bytes
font_01_sfnt_off00010e07.bin
1da8ff41db6ce662a14a2dc966c93f6f360fdb5b177778022f6039eb69c912e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 4420 bytes
font_02_sfnt_off00011d05.bin
a10ec87ff532fc2cf9b9a5833d14298226110f8060c023ffecb3c05ab8a56c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 14872 bytes
font_03_sfnt_off00014a8a.bin
2b3891ba7bb24a0c17bc2bbbde1d40304763d7fb8b547756aab3102380204d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8A 2320 bytes

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