Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a591ddfe8d5ec07…

MALICIOUS

PDF

69.2 KB Created: 2021-04-01 22:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8fc0d0fc405b7eab6c639681736a239 SHA-1: 25ee8e98fd9cbfc2605cfab96a8e8bb660f9eadc SHA-256: 3a591ddfe8d5ec07633590a1a110a7dbabe542a82b833952de3b583b87abda2e
126 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document. The presence of external URIs and a link farm heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=calculus+graphical+numerical+algebraic+answers
    • http://uscreditcheck.info/cyber_hunter_pc_hack2d7sx.pdf
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fd05404b1554.pdf
    • http://domensita.fun/a_christmas_prince_streamingpby7t.pdf
    • https://cdn-cms.f-static.net/uploads/4485016/normal_604e5d80ac6a9.pdf
    • http://ig-support-service.com/norcold_fridge_troubleshooting6158s.pdf
    • http://bedating.online/ghostbusters_full_movie_2016_putlockn4hk2.pdf
    • http://piwulag.sportsontheweb.net/75982111373.pdf
    • http://nesorus.mywebcommunity.org/bukuvenanijotirilu.pdf
    • http://trafikcezaodebayisi.com/how_much_is_a_roadmaster_bicyclek6g15.pdf
    • http://proba7.xyz/metugogzg9mi.pdf
    • http://tumuduwaju.mypressonline.com/icao_annex_10_vol_3.pdf
    • https://cdn.sqhk.co/pazakazagoz/7KnlS10/flora_and_the_darkness_beautiful_2d_platformer.pdf
    • http://davupopebuwiser.sportsontheweb.net/blade_450x_helicopter_for_sale.pdf
    • https://cdn-cms.f-static.net/uploads/4406191/normal_5fe7844534c70.pdf
    • https://cdn.sqhk.co/vopuvafamiw/ifdHhhr/big_game_hunter_2012_montana_day_3.pdf
    • https://cdn-cms.f-static.net/uploads/4411702/normal_6040eaf9bf148.pdf
    • http://cartest.pro/lizexafefifaxuxizipokuker2eeuj.pdf
    • http://afterdealer.pro/8841969216fe4mf.pdf
    • https://cdn-cms.f-static.net/uploads/4376854/normal_602be5694875a.pdf
    • http://kosonetibekub.medianewsonline.com/bivewurawelitovemebalu.pdf
    • http://eurofamily.pro/16161302427mcw64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zibelasavu.atwebpages.com/how_to_install_viewer_in_jio_phone.pdf
    • http://bitenozof.atwebpages.com/equivalent_fractions_coloring_worksheet.pdf
    • http://xevijojikutep.onlinewebshop.net/wrist_strengthening_exercises_nhs.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_off0000d340.bin
26ed7975e692068c6c4807f5d03dcf68dea52ef1e261a9d074727731faba019c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 5484 bytes
font_01_sfnt_off0000e5c2.bin
ae090fbbfe9954a8343df6e0cfc4ebe07084a991fed199981d5dd730d6183ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 9712 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.