Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7a7e9e92add12b…

MALICIOUS

PDF

70.5 KB Created: 2021-04-05 14:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1d7ad373b79190ffbf165472895e3b5c SHA-1: 24fcb588bc0ff616c985c26334f29093381d11ff SHA-256: 2f7a7e9e92add12ba45bee4affc3d09cbcf22f7c3e72ab15addc8652ea58aa1f
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=area+parallelogram+worksheet+tes PDF link annotation
    • http://vumexovuvelafe.medianewsonline.com/25108268892.pdfIn PDF document text
    • http://niwifara.22web.org/98650101943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6049e1880d499.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/biomes_and_ecosystems_worksheet.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/amaron_car_battery_price_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_601f70c0ccba3.pdfIn PDF document text
    • http://dujerewogirovok.22web.org/aashto_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_605374e5cba15.pdfIn PDF document text
    • http://bilapak.66ghz.com/rowutiviwufinutujigejuf.pdfIn PDF document text
    • http://taxokisekajetek.22web.org/70939166558.pdfIn PDF document text
    • http://mekapetakosa.22web.org/baywatch_video_songs_free.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/livre_apprendre_l_arabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479235/normal_5fce06e0a1392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noworevapetero.epizy.com/esl_upper_intermediate_reading_comprehension.pdfIn PDF document text
    • http://xarujubapemir.epizy.com/vofoxotegugixiviw.pdfIn PDF document text
    • http://vagilamiporaw.epizy.com/20866489172.pdfIn PDF document text
    • http://dokizoj.epizy.com/hematology_ethiopia.pdfIn PDF document text
    • http://xevorerokune.epizy.com/52233272406.pdfIn PDF document text
    • http://xudaribewipibe.rf.gd/dd_3rd_edition_free_campaigns.pdfIn PDF document text
    • http://sufumimunesepaf.rf.gd/advances_in_behavioral_finance.pdfIn PDF document text
    • http://bikawojesagoso.rf.gd/16733913511.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/xijewesixebusumip.pdfIn PDF document text
    • http://jejafajiw.rf.gd/count_character_in_excel_sheet.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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 5380 bytes
SHA-256: 283433de00aa50cd4afa9c9f3534843309d536bc3ca2c5baa3425cab9e12ad79
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 10636 bytes
SHA-256: 79bb0934a2373a0dec77b2336e3963e15f72acb4bc4cee3a21bde00aae0b8dc6

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