Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d9b268defad278…

MALICIOUS

PDF

75.4 KB Created: 2021-02-15 15:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c4e30955cd59a1e3fa7449b1a60a14d6 SHA-1: ee5df874edaefff93db8f573836620c546c40dd0 SHA-256: 31d9b268defad27866c1c15d9d85b0c7343146b725288dbff4735c5b8627a73c
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL suggesting a lure for textbook answers. The PDF's structure and embedded links point towards a phishing campaign designed to redirect users to potentially malicious content.

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://baarspo.ru/wix?keyword=en+espanol+2+textbook+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485149/normal_601906ecbfb90.pdfIn PDF document text
    • http://itclick.pro/xamarin_forms_android_splash_screen_image_sizeumhyw.pdfIn PDF document text
    • http://tuvugisuxizew.iblogger.org/60833370666.pdfIn PDF document text
    • http://iranomics.com/18071814306z8enw.pdfIn PDF document text
    • http://topfrag.rip/73584932480wzkl0.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/8XzIXwT/jefunomogijag.pdfIn PDF document text
    • http://secret-empire.ru/forecasting_the_weather_webquest_answer_keyzt02o.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/aiiy5hj/gifonejinak.pdfIn PDF document text
    • http://daimontimur.org/nuronuminopusozojigilavhxcs.pdfIn PDF document text
    • http://mimawusavap.iblogger.org/bayern_match_report.pdfIn PDF document text
    • http://glawerry.online/chess_master_gameboy1l81d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414175/normal_5fd9306440772.pdfIn PDF document text
    • http://apsmall.space/742339961272bz7r.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/hiiJahb/kogaponovirapinodafasiris.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_601b1022340cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://robebiwasufilu.epizy.com/88858139975.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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 5004 bytes
SHA-256: f9495c09842d5dff7a6b12d9637cb5cd427558fd8f6cbc47b889198eeee697e3
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 10944 bytes
SHA-256: e9421454ee2200768216a7134b849c94745013149340e4edb333cfd2ee6654d1
font_02_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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