Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c6a39e9ef03fa7…

MALICIOUS

PDF

66.7 KB Created: 2021-02-01 23:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6e91f54a55cd531d274e9346e3812824 SHA-1: d3b0266d7fc700d5433584c6a1ca28b584ef3dfd SHA-256: d7c6a39e9ef03fa7974c19840d8b6210eab890ec3a1d7bdb1a45ceddbc20c1a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of embedded URLs points to an attempt to redirect the user to malicious sites for further exploitation.

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://seumenha.ru/123?utm_term=systems+of+inequalities+word+problems+worksheet+kuta PDF link annotation
    • http://selozufuwadapuw.66ghz.com/create_new_label_template_in_word_2010.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hJcEz4v/mebikozasax.pdfIn PDF document text
    • http://hot-money.fun/asuran_full_movie_tamilrockers6lsa6.pdfIn PDF document text
    • http://akmurzina.com/piwuxawobakorudones0juy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422643/normal_5fced980d035e.pdfIn PDF document text
    • http://sosed.market/inside_out_thought_bubbles_apkpure7xi15.pdfIn PDF document text
    • http://mifvideo.space/bhagavad_gita_chapter_18_chinmaya_missioneq4s1.pdfIn PDF document text
    • http://limigulel.iblogger.org/suspicious_activity_report_fincen_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_5fdb40de10f98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/indian_army_song_djyoungster.pdfIn PDF document text
    • http://xaxidos.epizy.com/cdisplayex_1._2._18_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/chiranjeevi_movies_list_songs.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/jeopardy_games_template.pdfIn PDF document text
    • http://kifemulawej.epizy.com/magnum_pi_episodes_guide_2018.pdfIn PDF document text
    • http://luvibiw.epizy.com/36918534283.pdfIn PDF document text
    • http://jerovewoxisabu.epizy.com/zeputujobitaserujijapa.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_off0000c5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AE 5908 bytes
SHA-256: 2ce55930ed8c045b9fdcb4223616d314b3003712e9cd4e68901c6692caa4a794
font_01_sfnt_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 10380 bytes
SHA-256: 6fc809e2d0a34fc5dd90ed055eb59dfd82187a72c8d53a15d14ea7627a87f5ac

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