Malicious PDF — malware analysis report

Static analysis result for SHA-256 971fc260406cc92e…

MALICIOUS

PDF

83.0 KB Created: 2021-05-17 13:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: de14a278c53d5ba318f91d163479e4c4 SHA-1: de86f0411ee4780e78f4a47bae17b527bab09a8d SHA-256: 971fc260406cc92e83b4c4e0a8f204013384dcd87f627c9a7aab4983fd30f3cf
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high probability of malicious intent. The document body, though heavily obfuscated, contains references to engine oil and PDF creation tools, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=mercury+mercruiser+3.0+engine+oil PDF link annotation
    • http://kebakef.iblogger.org/audiology_science_to_practice_third_edition.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/masewafusutamunesupovisa89zds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_605b3b5d64f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_6060c78979e1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_60669d6eefe2d.pdfIn PDF document text
    • http://tokio-2020.fun/89686068453y4ymd.pdfIn PDF document text
    • http://vanlit.ru/bilif5y7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_6017bce296f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_6034620f9cfbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378404/normal_5fe517b31a040.pdfIn PDF document text
    • http://pestore.pro/53255468839pzxgw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_603949ede01b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_606c76e4e5c4e.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/jasipefulaxiduj/sat_subject_test_prep_khan_academy.pdfIn PDF document text
    • http://rukodulaban.epizy.com/wemamubik.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/spectrum_math_grade_6_answers.pdfIn PDF document text
    • http://vigogogakuza.epizy.com/beauty_and_the_beast_libretto.pdfIn PDF document text
    • http://deriwamunul.rf.gd/a_level_physics_edexcel_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/catacombs_guided_tour_paris.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/canada_passport_renewal_child_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/38213170381.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/ansys_welding_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/minecraft_apk_mobogenie.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_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 5356 bytes
SHA-256: 9bb3a8dbca222fa1a4fc0983db3327c54b26532b54076dd5e174710125b2dd33
font_01_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 10324 bytes
SHA-256: f8ca9e4ca87a8b96b41391f59b759d1854d9f210ffe9b35b4682e097581fdbaf

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