Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1970b2fc69b256…

MALICIOUS

PDF

65.7 KB Created: 2021-03-29 18:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54672343f907a146fbaa64ff2790aec3 SHA-1: 7f19e484ac90348356e45844ee0aa0340d1b67c0 SHA-256: 2b1970b2fc69b2560be5248e34d0c5b258cae528569172fb5c598b6fb1fd93a4
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the nature of the heuristic firings strongly suggest this PDF is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=quadratic+applications+projectile+motion+worksheet
    • http://pomawiwa.iblogger.org/computer_lab_posters.pdf
    • https://cdn.sqhk.co/rokunufoleti/iRg3iiH/fuseturixogokilebabaki.pdf
    • http://tefuvawilutir.mypressonline.com/pioneer_deh-x6500bt_bluetooth_no_service.pdf
    • http://kobopez.mygamesonline.org/48519903847.pdf
    • http://mazisim.mywebcommunity.org/riesgos_psicosociales_en_la_adolescencia.pdf
    • http://baxezafewel.iblogger.org/fupivakutowudepubeneme.pdf
    • http://fuxisileza.mywebcommunity.org/magnetic_loop_antenna.pdf
    • https://cdn.sqhk.co/bekegeraw/dxQ0lih/terineguvututugijufezotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dopodisimedu.epizy.com/make_your_own_cv_template.pdf
    • http://mitegoma.rf.gd/bokodibukebunowazoxu.pdf
    • http://xurosuforudev.atwebpages.com/bluetooth_receiver_for_beats_studio_headphones.pdf
    • http://vubibejibujala.rf.gd/how_do_you_thank_your_boss_for_positive_feedback.pdf
    • http://xutunebel.epizy.com/office_building_floor_plans.pdf
    • http://bogalibamadom.myartsonline.com/desde_que_edad_un_perro_es_adulto.pdf
    • http://fesemuk.rf.gd/68091618964.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c253.bin
6132af45f91fad177acda856958432102ae1947e460b766a844f27bf8d57a864		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC253 5608 bytes
font_01_sfnt_off0000d54b.bin
23af8109fa5ff51beee779b6b03d3a13d373bc72fbdcaae2f2b144bdd34f07ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 10672 bytes

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