Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25ddd5a7935d34e…

MALICIOUS

PDF

65.9 KB Created: 2021-02-18 23:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 45ecaa17422a223b43229198c527a315 SHA-1: df4596c12071ad735b1a4a95280ef49d71d97bbb SHA-256: a25ddd5a7935d34eccc69004e52801e4f04927103cd0803866264b9e944e8d8f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with a primary suspicious URL pointing to 'baarspo.ru'. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=subject+and+verb+worksheets+7th+grade PDF link annotation
    • https://cdn.sqhk.co/genopeno/YRgjsjg/letugiweminokeligilof.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/uhihhT8/fantasy_premier_league_download_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456686/normal_5ff26d8f2ebc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5fdf189d32339.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/gciakib/modern_warfare_gun_sounds_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_602307b3b2281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5fdf11057f1aa.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/9idAhbA/7_wonders_of_the_world_list_old.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/lezerawe/someone_calling_you_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/restaurant_partnership_agreement.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/zugoj.pdfIn PDF document text
    • http://savekuf.rf.gd/76470128532.pdfIn PDF document text
    • http://lagamifex.epizy.com/creative_resume_word_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/ccna_2_chapter_1_exam_answers.pdfIn PDF document text
    • http://tidegofavinugaw.epizy.com/star_spangled_banner_chords.pdfIn PDF document text
    • http://zonusaminotupe.epizy.com/kumoj.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_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 5784 bytes
SHA-256: e65e5355cf35585fc36a63575a36681bc4afede639fee62ad13ffe0fcd4ede20
font_01_sfnt_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 9768 bytes
SHA-256: 97b979e99d5938108ad663be2906dca78dd6b288d3a8ab723b7c87fe86fb98a8

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