Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c85cf471a5dd5a…

MALICIOUS

PDF

73.5 KB Created: 2021-03-24 01:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 88ec7e655d0ac8c41d13056a6835fee2 SHA-1: e172a6933ca69326ae9432cd296b660d9f189953 SHA-256: e4c85cf471a5dd5ab4cc319e3099f10e4858af9d70e3ae7ad01556a3945885f7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0' strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the ML classifier output point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nipisod.ru/wix?keyword=action+and+linking+verbs+worksheet+5th+grade PDF link annotation
    • https://cdn.sqhk.co/lazemowul/uje0e7g/33659171310.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/cN4Xxjj/diragagoruxawaxogamigip.pdfIn PDF document text
    • http://mishgen.com/dark_tower_series_hardcover_boxed_set0a9d0.pdfIn PDF document text
    • http://opticsystem.website/kuzogaxokimulibezofonisewm8zbe.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/gjPgrgi/vaxedexixojabemetizasebip.pdfIn PDF document text
    • https://cdn.sqhk.co/junukexad/iagia6x/19458352424.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/eyFiGhh/earn_to_die_unblocked_weebly.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/e0CNjgD/one_clue_crossword_word_of_the_day.pdfIn PDF document text
    • http://livecopyrightverification.com/84315318622ri3uw.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/d3dV4CB/ergotron_dual_monitor_stand_vertical.pdfIn PDF document text
    • http://soinjaga.ru/29409243432lqx8l.pdfIn PDF document text
    • https://cdn.sqhk.co/mozedizupi/jBKiaTX/rutefomugavidudeluwipoto.pdfIn PDF document text
    • https://cdn.sqhk.co/motuvitewodi/OgjRSha/24754768075.pdfIn PDF document text
    • http://stalekost.site/77051478111y7gso.pdfIn PDF document text
    • http://good-production9.site/97066841427d855z.pdfIn PDF document text
    • http://cmb-accueil.com/how_to_put_sim_card_in_lg_rebel_4iqbic.pdfIn PDF document text
    • http://probkin34.xyz/ssc_cgl_compound_interest_questionsucnon.pdfIn PDF document text
    • http://prostosite.site/64557094056d6fr6.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/0ggjBYz/xagapuxoluwowufi.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/hjJrhga/cowboy_caviar_paula_deen.pdfIn PDF document text
    • http://car-den.ru/what_is_new_classic_interior_design5ynw9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tufuripisaren.epizy.com/zutomivitoxu.pdfIn PDF document text
    • http://kogorokexo.rf.gd/how_many_points_to_pass_driving_test_florida.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/baby_bed_sheets_online_pakistan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 5456 bytes
SHA-256: 56cce33f15e3bb186459c1fde89a03a771b38831b18b891a916d4bceac87f342
font_01_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 10472 bytes
SHA-256: 9e257276007c4ee7f34d2d4b4482925b51aaddab83328f6fce9e1395ea084f10
font_02_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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