Malicious PDF — malware analysis report

Static analysis result for SHA-256 704df77c4f5a6cc2…

MALICIOUS

PDF

143.3 KB Created: 2021-03-20 23:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee74dea8b339a43ebbe812f3a4e376e7 SHA-1: b8ac4e4f46714157fb0bfb4f88ca25b584ee8122 SHA-256: 704df77c4f5a6cc21f2ba8088464885a0205b8f59740a34e81f1a3ff7e7d6726
134 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to downloading PDF books, aligning with the phishing heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=ccna+books+in+bengali+pdf+free+download
    • http://new-volosi.ru/open_cycle_gas_turbine88pjh.pdf
    • http://quickpapp.online/audible_stuck_in_queue8kre0.pdf
    • https://static.s123-cdn-static.com/uploads/4375541/normal_5fee5375bed7d.pdf
    • https://static.s123-cdn-static.com/uploads/4405194/normal_5fcf04b20b985.pdf
    • https://cdn.sqhk.co/xajamenujo/iagjhdx/jijumitelokova.pdf
    • http://xuzevofut.22web.org/wudiromuwoxuned.pdf
    • http://kiloritijuxat.iblogger.org/tavomukezo.pdf
    • https://cdn-cms.f-static.net/uploads/4476596/normal_603370468a4ed.pdf
    • http://5coupon.info/what_does_it_mean_to_fall_down_the_rabbit_hole9f2p7.pdf
    • https://cdn-cms.f-static.net/uploads/4376609/normal_60465e49aa344.pdf
    • http://lnstagram-helping-centre.com/wordpress_login_url_in_databaseskg6x.pdf
    • https://cdn.sqhk.co/disegivoji/X5s3X6i/detajaniledudulezekum.pdf
    • https://cdn.sqhk.co/pajokiman/nbhbOjf/download_sword_of_chaos_mod_apk_android_1.pdf
    • http://liketsven.xyz/sotatigizazudokuruzelimuk900.pdf
    • http://vpntop.info/80239283900gcob6.pdf
    • http://auto-fishing-rods1.club/pneumococcal_vaccine_guidelines_canada0hqmi.pdf
    • https://cdn.sqhk.co/jirudumom/bIkohbh/27382230233.pdf
    • http://filmera.ru/how_much_does_a_40_hp_outboard_weightuspjq.pdf
    • http://shoop-fg.ru/robert_half_time_reporting_and_approval_system9eta1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ruleruz.epizy.com/vomeforolimojiruxu.pdf
    • http://dusalotiwuje.rf.gd/15448998338.pdf
    • http://kepipejesa.epizy.com/abjure_verb_form.pdf
    • http://genenapukiral.epizy.com/60722056317.pdf
    • http://tosefiwaniw.rf.gd/can_you_put_a_tracfone_sim_card_in_another_phone.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_off0001db4f.bin
eae8d06bbc92ace5d6f60029a463653eaf23fa8b4678bf2f409ac7e725a2ed91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB4F 5348 bytes
font_01_sfnt_off0001ed83.bin
5bbfb71e7e79db7713d2dca3d61a529cd6bdf2162d19a91745b024a6fee9cfc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED83 2048 bytes
font_02_sfnt_off0001f660.bin
50d5ec22995de0907b265209c788759e4222145ef65402cd87cdd0bf52a54cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F660 12844 bytes
font_03_sfnt_off000220cd.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x220CD 4324 bytes

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