Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fec6e8b4807bf2…

MALICIOUS

PDF

92.4 KB Created: 2021-05-02 10:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7143dee0463050ad108b74ba332265e2 SHA-1: 28c350beb0dce2664c0f84b4a1dfc0ed93f68c8e SHA-256: c4fec6e8b4807bf2211cc7e8811f23a93e4c7d746ce5e8029d8ebe3232ea2685
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/strik?utm_term=mean+median+mode+range+standard+deviation+and+variance+calculator PDF link annotation
    • https://guwulazavuwaba.weebly.com/uploads/1/3/2/3/132302871/1d680763fb320e.pdfIn PDF document text
    • http://kasalewizu.22web.org/30234604207.pdfIn PDF document text
    • http://gatorama.fun/kuwukumenasovemipiruz3j2ax.pdfIn PDF document text
    • http://lojasamericanasbr.com/small_business_for_dummies_4th_edition_free1sdlg.pdfIn PDF document text
    • http://kapubasezo.iblogger.org/45251289893.pdfIn PDF document text
    • https://nodaveto.weebly.com/uploads/1/3/4/2/134266094/zisipaxap_zetofapi_desomafudoxexil.pdfIn PDF document text
    • http://tuwuneluzuso.22web.org/52066806876.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/jizafelebivo-sazoporibamu-gikutavobami.pdfIn PDF document text
    • http://xawikeroteguvu.iblogger.org/classroom_english_vocabulary.pdfIn PDF document text
    • http://wide-mean.top/nfpa_13_handbook_onlinemvj24.pdfIn PDF document text
    • http://tinonijo.iblogger.org/1988_honda_hawk_gt_650_parts.pdfIn PDF document text
    • http://card2card.live/how_to_run_an_offense_in_basketballzstth.pdfIn PDF document text
    • http://jumbochecker.com/87881114508b10z5.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/bissell_powerforce_helix_turbo_2190_belt_sizerqpxo.pdfIn PDF document text
    • http://wuvijenebomukib.iblogger.org/ruwuzulojetudajupuwa.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/dobuv_gimex.pdfIn PDF document text
    • http://bbflowers.net/what_to_do_if_your_water_softener_leakspt3w1.pdfIn PDF document text
    • https://nasuxixogidipan.weebly.com/uploads/1/3/4/7/134701521/7413952.pdfIn PDF document text
    • http://aov.one/691355170606cody.pdfIn PDF document text
    • http://sokuzise.iblogger.org/change_default_template_powerpoint_2016_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzawuwu.epizy.com/hey_baby_song_lyrics.pdfIn PDF document text
    • http://talagolow.rf.gd/48296844218.pdfIn PDF document text
    • http://nekofixas.rf.gd/naliti.pdfIn PDF document text
    • http://fixuwebevu.epizy.com/malaysia_information_technology_report_2017.pdfIn PDF document text
    • http://wazarirub.rf.gd/12670869396.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_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 5324 bytes
SHA-256: 6ced56abe8de2268edb363ed7de90110b008c8ae813422eb478f423484b48c6f
font_01_sfnt_off0001397d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397D 12164 bytes
SHA-256: 3b1b345f063b24f9f7072892dddae5927786c21c167a592759817fcfa34c04c2

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