Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8be983c4057cc7…

MALICIOUS

PDF

109.7 KB Created: 2021-03-15 12:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e8cb9c11288a3823d04c7043f734ae1b SHA-1: 6671c58b4484e5dffa213a6efc95a09a1166b621 SHA-256: 6f8be983c4057cc7acc72676efdd9598760d013944747559d476d143558d8499
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains an external URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware-hosting site. The document body, though heavily obfuscated, suggests a lure related to academic formulas, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/award?keyword=area+and+perimeter+formulas+for+all+shapes+pdf+in+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481406/normal_6046b494237d4.pdfIn PDF document text
    • https://dufadijikog.weebly.com/uploads/1/3/5/3/135325035/3280823.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/ib_november_2018_exam_schedule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5ff76ce2aabb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fc7dc049f443.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/john_deere_d140_for_sale_craigslist.pdfIn PDF document text
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/df831576f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_60375648272f1.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/norcold_rv_refrigerator_controls.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/the_natural_book_ending.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/is_baldurs_gate_online_multiplayer.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/27334976384.pdfIn PDF document text
    • http://poboxabirukus.iblogger.org/example_of_biology_lab_report_abstract.pdfIn PDF document text
    • https://duririsi.weebly.com/uploads/1/3/4/0/134096382/7362886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_5ff5409d0aebf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xexasuwoxomiba.rf.gd/sesozekilenu.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/and_another_thing_eoin_colfer.pdfIn PDF document text
    • http://keberugut.epizy.com/kagofogemo.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/asvab_paragraph_comprehension_test.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/zenoteluka.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/65224791830.pdfIn PDF document text
    • http://budapetag.epizy.com/sogogalominovudin.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/27590079945.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001509a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509A 5268 bytes
SHA-256: 407b9f4b5ed90e6edcb401e954283c60e5bbfa8ac4b917e9b476b06256c31ba7
font_01_sfnt_off0001625c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625C 13712 bytes
SHA-256: 21a6bcdbfba5d8b033da409da7fb0c07f60e2b3b90d41a4d7e5bc2e2eb4188ce
font_02_sfnt_off000190f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190F2 16844 bytes
SHA-256: 6c74234f625498815269b5cfe3669acfe55d6ebb25871491d6ec477dc31142a4

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