Malicious PDF — malware analysis report

Static analysis result for SHA-256 72dad49980ed8e8d…

MALICIOUS

PDF

68.8 KB Created: 2021-02-13 23:23:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 413b13dcdd93fc6ffbdc4cf354f67de7 SHA-1: 753e8c08d96f86c4407123d05eac2d9819c7a091 SHA-256: 72dad49980ed8e8db1e00fae939541ca86a78b2e176c0a1d14d07562f14f5281
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs designed to redirect users to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to exploit users through deceptive content, masquerading as exam answers to drive traffic to malicious infrastructure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=honors+geometry+final+exam+with+answers In PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/litoviwoso.pdfIn PDF document text
    • https://metipejoxeve.weebly.com/uploads/1/3/4/7/134725173/xevawa.pdfIn PDF document text
    • http://triple-doska3.club/pefawiturigptnxt.pdfIn PDF document text
    • http://lovunusugi.22web.org/android_browser_mit_video.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/gopamatipefuj-gisegatugojedi-lobexow.pdfIn PDF document text
    • http://alexsaf.ru/sms_message_not_delivered_on_machtq80.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/l3hchff/68969311379.pdfIn PDF document text
    • http://photoforce.ru/at_t_thanks_app_can_t_log_inc8hdf.pdfIn PDF document text
    • http://matroskin.space/flight_sim_2018_mod_apk_rexdlpohsq.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/cTjfYRs/romogawujesiraxidi.pdfIn PDF document text
    • http://ritikutoxukor.22web.org/nikaju.pdfIn PDF document text
    • http://mebel-albero.ru/harry_potter_hogwarts_mystery_potions_owl_answersn2kjq.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/desenaz/characteristics_of_business_report.pdfIn PDF document text
    • http://kutifakibidi.rf.gd/bliss_android_emulator_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/gisenezuginural.pdfIn PDF document text
    • http://tikixowogozomi.epizy.com/jspdf_autotable_hooks.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/classify_quadrilaterals_lesson_32_answer_key.pdfIn PDF document text
    • http://mugekalamiwatek.epizy.com/miracle_crack_2._78_free.pdfIn PDF document text
    • http://memegimowa.epizy.com/pronoun_agreement_worksheet.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_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 5404 bytes
SHA-256: 0b458e776e0711e5f7027447268d13c07541f301d52ae84489a5b9a8743b4c8f
font_01_sfnt_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 10368 bytes
SHA-256: 9595e43c9d64de3c77e78b280935de9bed7b6daf7aef100432860f555d80ca68

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