Malicious PDF — malware analysis report

Static analysis result for SHA-256 9074270ebe735935…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 15:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 935f9c72214d32356cdeee1a336052e9 SHA-1: 7cfa253a0f6059cde3279ba5a273e7bdda8c6791 SHA-256: 9074270ebe73593523afda89f79d9fe147f3edbdf484694a3be2f49002af8658
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to reading material, which is a common tactic for phishing or malware delivery.

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/strik?utm_term=books+to+read+in+your+20s+female
    • http://wupidubame.mywebcommunity.org/pleural_mesothelioma.pdf
    • http://wipunemobak.mygamesonline.org/jirazudezunetomedobumapum.pdf
    • http://tuwukadinem.mygamesonline.org/53879119560.pdf
    • http://sowoxapexemex.sportsontheweb.net/geometria_y_trigonometria_de_baldor.pdf
    • http://sijubuwejipamun.mywebcommunity.org/selekegufegibovuwewus.pdf
    • http://somixewavado.sportsontheweb.net/itil_v3_certified_logo_for_resume.pdf
    • https://cdn.sqhk.co/pategazikiw/eieicjh/nuzozuweje.pdf
    • https://cdn.sqhk.co/fimegasaz/agc4hhT/vefak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4cd741f8-c277-469f-8b3a-397b06ac0d39/daniel_hart_power_electronics_chapter_2_solutions.pdf
    • http://zuvuzevo.atwebpages.com/samalem.pdf
    • https://uploads.strikinglycdn.com/files/07d28e9b-a0cd-4a97-a1f5-807c369b6035/mini_smart_socket_awp02l-n.pdf
    • http://fabedidatifi.onlinewebshop.net/is_the_seneca_niagara_casino_open_today.pdf
    • http://wenibeliso.atwebpages.com/us_craftmaster_water_heater_age.pdf
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_c38fee30781049f48e02df43c6ab809f.pdf?index=true
    • http://rorazizaxaf.atwebpages.com/rebejagotuzesujonutozuti.pdf
    • http://fajenadiwizowo.atwebpages.com/bsc_1st_year_chemistry_syllabus_download.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_56b66b562573435fbe3159015119bbbc.pdf?index=true
    • http://zatuvejamubolo.atwebpages.com/how_to_screenshot_on_lg_velvet_phone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee44.bin
173b3e93068fe05dd9abd4b9a2a2f63836cc3ed9feddfc0618d804319ee4ee71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 5540 bytes
font_01_sfnt_off00010112.bin
810e86107de0535b1aa21d492e9117018e6f9564ca3916018aeffd3f5a8dcdcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 10604 bytes

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