Malicious PDF — malware analysis report

Static analysis result for SHA-256 638f0d1d000d3bea…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 20:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 14e63cfddf2c25480543cae24975feb8 SHA-1: 051b939e789e2f1346f32ec06d5e61b6bcfc170c SHA-256: 638f0d1d000d3beaf197fffe8c438c2c9d2e87b9b337c082dad69e476b76671d
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and ML classifiers as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+do+you+write+an+address+for+ireland PDF link annotation
    • https://cdn.sqhk.co/vemonososepa/igwjagh/moveja.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/MgeKhcc/domenonozowo.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/gi0gihf/selipewodozikeliworukej.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/gj1mMhg/dreamgear_50_in_1_game_list.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/when_to_use_because_or_as.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/kXjehcq/bedwars_texture_packs_hypixel.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/wPhfqgi/prizefighter_band_chicago.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/vgcgchj/pixel_gun_apocalypse_3_unblocked_game.pdfIn PDF document text
    • http://lorezagosuvese.scienceontheweb.net/gamegijimaz.pdfIn PDF document text
    • http://straponartist.com/angry_birds_epic_mod_apk_20197tf53.pdfIn PDF document text
    • http://italy-small.space/cambio_de_propietario_df_formato_r-7-43kfirc.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/fakowixobevuvozawilupobe.pdfIn PDF document text
    • http://nafesotarun.22web.org/risk_assessment_report_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/lilovenodi/haKjagd/pocket_warriors_2.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • http://naturmilans.fun/human_skeleton_anatomy_activity_answers4gymr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezirateba.rf.gd/ielts_reading_recent_actual_tests_vol_1.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/tonezinozamani.pdfIn PDF document text
    • http://kulisiwodomewa.epizy.com/prefix_and_suffix_list_in_english.pdfIn PDF document text
    • http://togotavasokuzez.epizy.com/line_6_toneport_ux1_review.pdfIn PDF document text
    • http://lukagaxa.rf.gd/50_most_common_adjectives_in_english.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/31024214261.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_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 5056 bytes
SHA-256: dac68acdb9dd54c4e1502f2256eb75b8ead4b5d386dd6f2fecdd3fdd05039d9c
font_01_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 11012 bytes
SHA-256: d7ca73c5f5eac609c9ddf00ce04c9f014b0758283fa47ff56f3d23362a46244e

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