Malicious PDF — malware analysis report

Static analysis result for SHA-256 139918a3570d1084…

MALICIOUS

PDF

80.4 KB Created: 2021-03-31 12:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6403c3c7a1c363722200e6adec570eb8 SHA-1: dd82c26a5c54aab4fb4393198c712a4dd694b201 SHA-256: 139918a3570d1084336aba2bc5b7d91e6930bea10c2215a3cc69ff7ffa72c26a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/strik?utm_term=what+are+current+mortgage+rates+bank+of+america PDF link annotation
    • http://pidawudimo.scienceontheweb.net/animal_farm_full_summary.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/how_much_is_20_extra_credit_points.pdfIn PDF document text
    • http://ecoterritory.store/dotuxilabiwegakumafzl4bk.pdfIn PDF document text
    • http://furniture21.online/31820888437xbonr.pdfIn PDF document text
    • https://cdn.sqhk.co/koluvukirate/jhjbIgg/zujatufimobiparujolef.pdfIn PDF document text
    • http://otshelnik.net/the_magician_tarot_card_astrology2s8if.pdfIn PDF document text
    • http://fitatuvepejozo.sportsontheweb.net/filifunogorijilino.pdfIn PDF document text
    • http://idealsit.space/inquisitor_martyr_crusader_bolter_build90rtq.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/fipepesamikenozajax.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/xekezezaz.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/remikejizawetozemaxugazumk3mzf.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/17723549636.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/kkoejgA/nitatavomofijufe.pdfIn PDF document text
    • https://cdn.sqhk.co/jikowuzu/cOhdfrZ/au_mix_mod_apk_revdl.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/structured_design_methodology_in_software_engineering.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/jobosikaks0mkn.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/55138102901.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/gjhaXha/55459932844.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/iiehadj/pikaxa.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
    • https://uploads.strikinglycdn.com/files/aa90d5bd-e157-4ecd-a0d2-266bc5f59298/advaita_bodha_deepika_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8cef94-6d77-4a5b-8445-b3704c94cbbe/lamunatepazakedepaxikula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032212c3-1d74-4f76-8a38-3ac59de53e7a/27803403056.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/jaretunojoginiwajelobebut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c1e4ad-3b58-4b2a-a271-ee26a7a3e101/69513477200.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/litezoxejelimu.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_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 5360 bytes
SHA-256: b95c14d91093b66e79dac98152d1738795206f600b77ffdf28dc3a195bec4700
font_01_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 11212 bytes
SHA-256: 6e1f27bc4fd0c86e6038df1f431e0785d08f24e65c999a007c1553dbf3568a0d
font_02_sfnt_off00012509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34