Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8c4dbee8c79db7…

MALICIOUS

PDF

78.9 KB Created: 2021-03-15 16:07:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3ec08c1b00daab1b60e532467f3bf81f SHA-1: debcbff97395db75a3c97276274971be9a95b393 SHA-256: 4f8c4dbee8c79db787d302e8a7ee1a07fa9b714c58f0ee3a9fabfd230fdb0ee5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is flagged as external. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, contains keywords related to a router, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jottigo.ru/strik?utm_term=asus+rt-n12+n300+wifi+router+2t2r+mimo+technology PDF link annotation
    • https://cdn.sqhk.co/zafupusapun/6gcqijq/tamil_murder_mystery_movies_2019.pdfIn PDF document text
    • http://wagajikis.iblogger.org/almighty_thor_dual_audio_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_602f788fb7ff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_601937370878a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_600e3877d415f.pdfIn PDF document text
    • http://wunowixumofe.22web.org/zunuvakesaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_60190d3a15635.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/21330374811.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/gtihXhh/cut_the_rope_experiments.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_60334c02df56d.pdfIn PDF document text
    • https://cdn.sqhk.co/pelemobi/ibNmFQY/dinifalobatixagewulox.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/jiifKgf/33022861300.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c8606b-094f-4273-ba3c-31cd6d224473/how_to_tell_which_wii_model_you_have.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/7835403041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed19f08-30d3-4c2d-a11d-1761e292f59d/88012435744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40dc04d7-c519-4bb2-83db-d79429636b56/applied_statistics_and_probability_for_engineers_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cdf181-cf66-4e66-87d0-007a724e6160/how_to_set_stopwatch.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/11240978123.pdfIn PDF document text
    • http://semekumuxolat.rf.gd/see_beneath_your_beautiful_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc6a90e-68f9-40b1-8f43-28670e8ee68e/bowflex_exercise_chart.pdfIn PDF document text
    • http://gegurobaz.myartsonline.com/why_does_it_feel_like_ice_is_running_through_my_veins.pdfIn PDF document text
    • http://xadamun.epizy.com/even_and_odd_numbers_worksheets_free_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45be793b-3384-41d1-a1cf-4887249152b2/god_is_a_matchmaker_by_derek_prince.pdfIn PDF document text
    • http://tanonarimunal.myartsonline.com/stihl_lawn_mower_comparison.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/55258151465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d89ab8-781d-4c7b-90d4-f742a5844e21/64313574702.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_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 5788 bytes
SHA-256: e737b407842a8f59f5ee8b439eb4e4f6fd3985b9b754a1039456ecb45bbae1bd
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 11012 bytes
SHA-256: 229cacf634f2080145ea9f55ca4542c5c8728c56a4a652a9d5fd0f325aa43eae