Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dffa5feaf083145…

MALICIOUS

PDF

84.3 KB Created: 2021-03-27 15:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7b2a66b831b82bd933619765c39610a4 SHA-1: c24fa4f5ac1b66f0a9b28867debbee6292410ea1 SHA-256: 6dffa5feaf0831451ea89ea83a5f7e20e7615029529f25e4c14f1565b567d512
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting domains, suggesting a phishing or link-farming operation. The document body, though heavily obfuscated, appears to be a lure related to a 'Worksheet on sound waves'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=worksheet+on+sound+waves PDF link annotation
    • http://xabudumame.mypressonline.com/youth_mental_health_first_aid_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/bDghieT/fun_things_to_do_seattle_winter.pdfIn PDF document text
    • https://cdn.sqhk.co/kanereneb/pA0iik7/813225206.pdfIn PDF document text
    • http://myluckywin.site/903052834679gftg.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/what_is_your_perspective_of_god.pdfIn PDF document text
    • http://modalidetefid.iblogger.org/corbettmaths_2014_answers_parallel_lines.pdfIn PDF document text
    • http://shopmzm.site/green_eggs_and_ham_cast_ellen_degenerespi1ve.pdfIn PDF document text
    • https://cdn.sqhk.co/xadelakora/jhcbijM/sleeping_dogs_definitive_edition_ps4_trophy_guide.pdfIn PDF document text
    • http://indonesia2health.online/smart_goals_template_excel8hae8.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/gfijEgj/dojata.pdfIn PDF document text
    • http://ceter.xyz/how_to_change_load_order_skyrim_xbox_oneaw13m.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/nizesosazitudusapazige.pdfIn PDF document text
    • http://gukolifuk.iblogger.org/dream_a_little_dream_of_me_uke_chords.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujawonevafo.rf.gd/choosemyplate_food_group_portion_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a23a2e-307e-4bf9-9cd4-24620378ab68/tamil_novels_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fd5d8a-ac8b-4671-9005-c3907d56cb58/jobs_in_ghana_and_their_salaries.pdfIn PDF document text
    • http://bogetezapore.rf.gd/99962004833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993a3104-a266-4e69-b4f9-83836ed84118/31042326744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bd5ce4-2de5-48f5-bde7-32be689c78ba/google_sketchup_2016_free_download_64_bit_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e4f05c-382f-46ff-a69b-bc65bbac7ea5/33813761388.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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 5112 bytes
SHA-256: 84592856bafff7fe1c13957a2fddfa389530e6499aaaa4e077136f20500ec5de
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 11832 bytes
SHA-256: 5a760dd6c730e430286833e00509025e52240d985c7f274eabf6f558760d28bf
font_02_sfnt_off00012d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D33 16376 bytes
SHA-256: 5556131384d64af3346692dfc690d10917c5f540de6c489b20a8ea3d6d4e4492

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