Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34888b11216b46e…

MALICIOUS

PDF

71.7 KB Created: 2021-01-23 08:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f87d25ed8c78e29b9fecc9f0f232fe1c SHA-1: da872a636e7dfd7027b4cb7d76b536354a254e25 SHA-256: f34888b11216b46e9e372c0dc5dfefc365fa6311e00f7e2c83c3268b10963e89
126 Risk Score

Malware Insights

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

This 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, suggesting a link farm designed to distribute malware or phish for credentials. The document body, though heavily obfuscated, appears to reference file explorer and manager applications, likely as a lure.

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://bologen.ru/123?utm_term=es+file+explorer+file+manager+apk PDF link annotation
    • https://site-1211506.mozfiles.com/files/1211506/92440380244.pdfIn PDF document text
    • https://site-1177663.mozfiles.com/files/1177663/aha_living_a_boy_s_adventure_tale_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/gggijgg/kirip.pdfIn PDF document text
    • https://site-1178831.mozfiles.com/files/1178831/free_tv_show_apps_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/ojbhgwU/metal_slug_6_pc_version.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/K8giVPm/3108295178.pdfIn PDF document text
    • https://site-1173169.mozfiles.com/files/1173169/crowd_update_singapore.pdfIn PDF document text
    • http://rujajabejeveto.66ghz.com/hernia_diafragmatica_congenita.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/ijEjjO9/rigogigebasemifepalu.pdfIn PDF document text
    • https://site-1226269.mozfiles.com/files/1226269/banukarivanagitavo.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/fQhhier/sunshine_house_sturgeon_bay_facebook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefebewo.epizy.com/baaghi_1990_movie_video_song.pdfIn PDF document text
    • http://susupufewowe.epizy.com/samsung_galaxy_s8_get_android_10.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/paduxawuruboxa.pdfIn PDF document text
    • http://bixikaw.epizy.com/exfiltration_test_report.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/cue_file_template.pdfIn PDF document text
    • http://zijomofi.epizy.com/walking_dead_clementine_cosplay_guide.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/kuzulidabofiseropavobogiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 2888 bytes
SHA-256: c82bebd4b493aaaf84143f05ff6967641e6933e4069ecd51460b008fb5b9cf8a
font_01_sfnt_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 5312 bytes
SHA-256: 4832fa11179e57d9362140af7ca52f8278500533af93b9c56361ab878b1977d7
font_02_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 11676 bytes
SHA-256: df77b7d18985d5fd448748ce6f2761179b34413e1cd0ff52ac4c2d7833299eb4

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