Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafd88b9215ec041…

MALICIOUS

PDF

72.8 KB Created: 2021-02-24 19:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ed602fe9fa8569fc1ceb7cc33cd1c9f SHA-1: e1d4c7e6b665f3b26cfcddcbc98271f7857069a9 SHA-256: aafd88b9215ec041de6268fe3917ac06becc972d9c28ea27c89dbbb45fb8bb08
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one prominent URL pointing to 'seumenha.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a document. The presence of many disposable links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=design+of+steel+structures+notes+ppt
    • https://static.s123-cdn-static.com/uploads/4456705/normal_5fc8691911066.pdf
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/sikibuvavuxe_tuxaxeruzimired.pdf
    • http://mangalvpodarok.ru/54001307114bdre7.pdf
    • http://expressday.online/android_emulator_for_windows_7_for_pubgg6773.pdf
    • http://lobabinuladeri.medianewsonline.com/charter_remote_setup_new_tv.pdf
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/dosizosejawidix.pdf
    • https://cdn.sqhk.co/mixubiki/ihgjeif/the_archers_2_mod_apk_all_unlocked.pdf
    • http://nokasosozigof.mypressonline.com/69233769859.pdf
    • http://kirakexig.mypressonline.com/dilezazizazowufo.pdf
    • http://shoop-ft.ru/biocalculus_calculus_for_life_sciences_free8f8cn.pdf
    • https://cdn-cms.f-static.net/uploads/4423166/normal_6032f5d34d94e.pdf
    • http://siwosupegejolop.medianewsonline.com/wimapodumixesikapizokinek.pdf
    • https://pezibife.weebly.com/uploads/1/3/4/3/134376528/fasumelit.pdf
    • https://cdn-cms.f-static.net/uploads/4501659/normal_602d4ed409eba.pdf
    • https://cdn.sqhk.co/telazaje/e5pgchc/memebaaz_memes_short_videos_app_download.pdf
    • http://sowopezamiw.medianewsonline.com/why_does_jocasta_kill_herself_in_oedipus_rex.pdf
    • https://static.s123-cdn-static.com/uploads/4385202/normal_5fced9badf040.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tefetuzuzip.myartsonline.com/ski_doo_service_manual_2016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ce.bin
df161fe416fa9411a695e34f6f8024972bbbbf35381819bf9d1d4098dab7dfe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 1728 bytes
font_01_sfnt_off0000dde9.bin
560c7cd3f5cdc34f22ec8d1476c7669d1bda3f39046a23d16ecf39f1f835c5b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 4972 bytes
font_02_sfnt_off0000eef8.bin
5996dabc07b0f9aa206e305327bf1f9dbf22567c8813981ca6916039e7c6dbc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 11908 bytes

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