Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a454b89acd03fd7…

MALICIOUS

PDF

118.1 KB Created: 2021-04-05 14:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dece0066db16e831cd53d94ca79ad7df SHA-1: 25d5bab54b3e1d76ec5c11ad25c2357f03bc9875 SHA-256: 4a454b89acd03fd70baefebd687f483eb306b3b140b40f8ef49e210516f98478
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://golowaki.ru/award?keyword=antimicrobial+activity+of+plant+extracts+by+disc+diffusion+method+pdf PDF link annotation
    • http://newsportstechnology.ru/nixipafopiwowabijontq17r.pdfIn PDF document text
    • http://test123test.xyz/24972469815ma4ku.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/computer_age_statistical_inference.pdfIn PDF document text
    • http://funusamemis.22web.org/abs_workout_chart_step_by_step.pdfIn PDF document text
    • http://wokulorumal.iblogger.org/aagadu_movie_krishna_flute_music.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/wedding_dress_sewing_patterns.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/bls_aha_2020.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/international_handbook_of_behavior_modification_and_therapy.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/48325893911.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/how_much_does_it_cost_to_coil_bind_a_bookl137p.pdfIn PDF document text
    • http://mini-camera-super.club/o_perico_mario_flores_moringaebzo9.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/application_of_binary_tree_in_data_structure.pdfIn PDF document text
    • http://moneymaya.site/kovibukavepokofukamefu53ekr.pdfIn PDF document text
    • http://kepupefidi.iblogger.org/vufufebonopejiriwizowiviv.pdfIn PDF document text
    • http://puvabagafiwapi.22web.org/38035018035.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/analytical_chemistry_exercises.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/does_a_cup_of_tea_calm_you_down.pdfIn PDF document text
    • http://fedumizikel.epizy.com/tebujoro.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/17586008357.pdfIn PDF document text
    • http://suruliloxapesas.myartsonline.com/denekowad.pdfIn PDF document text
    • http://ragakinetepufub.epizy.com/67079871478.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/72885185976.pdfIn PDF document text
    • http://dunuruzofugavix.rf.gd/shopclues_apk_app.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/towoketeki.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17432 5756 bytes
SHA-256: 68fe9eefdc626e803b4ca39a286da7f563e8ab0494c1e4c2612a1eca6fc7cc67
font_01_sfnt_off000187a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187A4 13284 bytes
SHA-256: 023baac427463eb80ce92f4f611ff8559fa855d46277fe0b4d001a24019bffbd
font_02_sfnt_off0001b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B194 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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