Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae75606d11286098…

MALICIOUS

PDF

75.7 KB Created: 2021-03-23 18:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7d247190f5719adaf927137b4e166d4a SHA-1: 6dea4ce08814d1a175e046b78fe4756e0a08cf75 SHA-256: ae75606d1128609846d360c0b304ed5f909b52063e6c605ff03f41a0803728a1
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a phishing lure related to exam timetables. The embedded URL, 'https://jacksth.ru/123?utm_term=cbse+10th+board+exam+time+table', is presented as an image lure linking to an SEO redirector, strongly suggesting a phishing attempt to trick users into downloading further malicious content or revealing sensitive information. No scripts were extracted, but the PDF structure and URL indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=cbse+10th+board+exam+time+table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468255/normal_5fd245410d1bf.pdfIn PDF document text
    • http://sravniproxy.info/new_call_of_duty_modern_warfare_multiplayer_gameplays9yie.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/julelinefabubipugerada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_604fce1297978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_604cd24882864.pdfIn PDF document text
    • http://kepojitu.22web.org/29296544854.pdfIn PDF document text
    • http://vidclips.design/cfa_institute_level_2_exam_weightsohxqi.pdfIn PDF document text
    • http://ponaleke.iblogger.org/34113423248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375907/normal_5fef3adbbb729.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/kukazowox/static_variable_in_template_function_c.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/35913972918.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/30951027213.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/new_south_movie_film.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/nodejaxatenorarir.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/97418824201.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/1155602534.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/bade_bhai_sahab_question_answers_class_10.pdfIn PDF document text
    • http://kunijudodo.rf.gd/battlefield_bad_company_2_android_game.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/danuxifozegipobutikexe.pdfIn PDF document text
    • http://vumesurev.epizy.com/pengendalian_nyamuk_anopheles.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/celestron_astromaster_114az_review.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_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5372 bytes
SHA-256: 3d55dbfbc3204f0854f2b14e544c9c71194f589136eca7c66f262afb294a7690
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 10760 bytes
SHA-256: 70b1a5d54a4ac7637cfb308a7d9735bca5f4e2aa4aafedc34fa9b279a730bb8f

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