Malicious PDF — malware analysis report

Static analysis result for SHA-256 7920d3f225a57618…

MALICIOUS

PDF

82.8 KB Created: 2021-03-18 22:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 132cf3082191d5d162ce0411a32952bb SHA-1: d37e8092ca407baa2789bbe47bbbea5b51f722be SHA-256: 7920d3f225a57618a53f6af1c8440aa58a8e2d9933e1c9c4354da21650e81f30
192 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a 'download button' heuristic suggests a social engineering lure to trick the user into clicking the malicious link. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=pdf+of+civil+engineering+interview+questions In PDF document text
    • http://mini-camera-super.club/negexolibukep4ipp.pdfIn PDF document text
    • http://yoga-fitness.space/kotak_cash_deposit_slipvo1nt.pdfIn PDF document text
    • http://nozatisesufi.scienceontheweb.net/nunca_foi_sorte_livro_adriana_sant_anna.pdfIn PDF document text
    • http://xepekil.iblogger.org/barracuda_ng_firewall_installation_guide.pdfIn PDF document text
    • http://it50disconto.info/indian_stock_market_downloadcxd8l.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/sample_letter_of_agreement_between_employer_and_employee.pdfIn PDF document text
    • http://tiledevaw.22web.org/beowulf_tolkien_ita.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/igGgiX9/e_commerce_websites_templates_free.pdfIn PDF document text
    • http://gevilubim.iblogger.org/datexigijeweza.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/66661469951.pdfIn PDF document text
    • http://italywow.info/186018547nn08l.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/15889191156.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/64244323513.pdfIn PDF document text
    • http://bezprovodov.guru/managed_file_transfer_gartnermn441.pdfIn PDF document text
    • https://cdn.sqhk.co/gugirejol/fJjdUjf/private_islands_for_sale_usa_cheap.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/18545074156.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/UjhWTqv/20815199483.pdfIn PDF document text
    • http://tumexade.22web.org/sanuberotitilujixokoti.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/borges_ficciones_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://magasebaboderaz.epizy.com/bolsa_mexicana_de_valores_historia.pdfIn PDF document text
    • http://tizepadeda.rf.gd/jorurivubepukemuwu.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/database_management_system_sql_commands.pdfIn PDF document text
    • http://vojevawe.epizy.com/puwovegekizuk.pdfIn PDF document text
    • http://gorivipap.epizy.com/gojogotupibizugumugaf.pdfIn PDF document text
    • http://zaramapowo.rf.gd/41300011376.pdfIn PDF document text
    • http://xasonivuk.epizy.com/59325747433.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 5140 bytes
SHA-256: 39de1883fd448402ceafb141b928902f93dded5e95a5e8a214a76abefa237042
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 10816 bytes
SHA-256: 9278eb353ac36b1c31c4e7320d2035054f7d06c3b1e3c763cfb443b027866245
font_02_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e