Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f10f70fed01c5b4…

MALICIOUS

PDF

88.8 KB Created: 2021-02-28 04:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b84664b4f446464568a3c3f5151822fe SHA-1: d2e68f6999bb8dc9201fa4fd36c6dc23e759180e SHA-256: 3f10f70fed01c5b400694ca663d02e737e85cfc9ebe12f31d09091f6ff9d2b84
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a 'physics 9a lab manual', aiming to trick users into visiting these malicious sites.

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://botokaw.ru/wix?keyword=physics+9a+lab+manual PDF link annotation
    • http://trikotoria.ru/good_and_scates_validity_testf6hvd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fdd22aa0a01e.pdfIn PDF document text
    • https://cdn.sqhk.co/ragekasa/hCggyib/chase_mobile_digital_wallet.pdfIn PDF document text
    • http://idealica-italiaofficial.site/ipad_mini_pro_2020_gsmarena7lx1z.pdfIn PDF document text
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/4607599.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/most_successful_vcs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529095/normal_601229143879f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_602ff8914133e.pdfIn PDF document text
    • https://zajuzuvo.weebly.com/uploads/1/3/4/4/134474050/1bd7fe.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/4idNeEr/latimab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_602054259f6aa.pdfIn PDF document text
    • http://biggymstoe.com/tesepudedatatezokadipigvpvgn.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://dukedofabi.epizy.com/69530002460.pdfIn PDF document text
    • http://lofomaseforuz.rf.gd/6th_grade_reading_comprehension_test_nc.pdfIn PDF document text
    • http://solatilexi.epizy.com/lewopukazimuvaluwopelapip.pdfIn PDF document text
    • http://bubewap.rf.gd/quran_surah_rahman_audio.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_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 4916 bytes
SHA-256: edc1c04b7d7aec9cbd7c2ea0336c1ffe3e83d7d316baac8707a78ff80d18fb25
font_01_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 10568 bytes
SHA-256: 1a2c36cea5d0f42f1dfafba14425246ea3116e2a298e7c88b647f35b9cc650fe
font_02_sfnt_off000147a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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