Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4a0b8dc7982e48…

MALICIOUS

PDF

169.5 KB Created: 2021-04-03 04:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c87b28c87cdb1b0a1d206a00ec285ed1 SHA-1: 7a53050016992f8dc4051d0670a0441d201fe59c SHA-256: 3f4a0b8dc7982e4898e57494d377c19fc32d5ef97cfb016ce248db87d2bb0be5
136 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 high likelihood of malicious intent. The document employs a common phishing lure related to educational materials to entice users to click on a link. This link, https://dugedepap.ru/award?keyword=grade+9+english+module+4+anglo+american+literature+pdf, acts as a redirector to a phishing site, aiming to deceive users into providing sensitive information. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/award?keyword=grade+9+english+module+4+anglo+american+literature+pdf PDF link annotation
    • https://fubapisa.weebly.com/uploads/1/3/1/4/131406294/bafagukowawotuka.pdfIn PDF document text
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/f4599f181.pdfIn PDF document text
    • http://womaruzufoxila.iblogger.org/how_to_get_rid_of_water_bumps_on_feet.pdfIn PDF document text
    • http://abanca-electronica.com/bukafojifigzie3f.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvetuzaxi/jaqjdhe/lenovo_warranty_support_and_service_team.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/ihUihoW/poxodoperaxubuw.pdfIn PDF document text
    • http://idealica-tufficiale.website/jvc_flats_reviewyadad.pdfIn PDF document text
    • https://gunagejosiva.weebly.com/uploads/1/3/0/7/130738835/faror-zikelu.pdfIn PDF document text
    • https://gupobotinifetex.weebly.com/uploads/1/3/4/3/134338345/lezodepupefumik-nifawamowotog-lidira.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/gjjjiaq/56992366423.pdfIn PDF document text
    • https://zadidiboz.weebly.com/uploads/1/3/5/2/135295834/zajusewoburojo.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/gidiw.pdfIn PDF document text
    • http://zamigunuzowa.epizy.com/audible_in_itunes_importieren.pdfIn PDF document text
    • http://rinubef.epizy.com/wadulokemilixudu.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/reroge.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/dusozawesigin.pdfIn PDF document text
    • http://dolasuwukino.epizy.com/sawir.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_5af0943d26f647809edad0893ded5a9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/lupibudob.pdfIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_8096541d38b649a08736297cb637faff.pdf?index=trueIn PDF document text
    • http://xiromenabagagi.rf.gd/cashier_cv_format_in_word.pdfIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_2f41e7815cd14938b62613f192008b45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sikuva/bovee_1000_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CEF 1812 bytes
SHA-256: f64348aec387676f4e6be919c615061f94e68919e81ddab1c12cd23bb732e9e4
font_01_sfnt_off0002459c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2459C 5844 bytes
SHA-256: bafa4d5be01d651224d78eecadd7aa2c3c4d1a8cbfca94134a732c79c5f7f47f
font_02_sfnt_off0002595e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2595E 11448 bytes
SHA-256: ed3c4ba2a2bd821f4fe80f83d88df04db272f930ee3bcd620d01698312c79ee9
font_03_sfnt_off000280af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x280AF 16232 bytes
SHA-256: bdc21286594a69dc0968ca5bd99613de364be0f673e07e33298ba5ff8abf051c