Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a09809d9c38650…

MALICIOUS

PDF

82.7 KB Created: 2021-05-04 17:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 57c51df4c47b28db9588ae7136648317 SHA-1: 548dd81585821aa700357cb330f9fe26dfd37c27 SHA-256: 78a09809d9c386507f6ccc3b682845acaadb3b30910d8c1f1903626b9e2d45f6
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 0.9993

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://ponafet.ru/strik?utm_term=what+is+a+partnership+by+estoppel PDF link annotation
    • http://fidekeleko.medianewsonline.com/how_to_pray_for_a_good_future_husband.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/conflict_resolution_techniques_for_youth.pdfIn PDF document text
    • http://nuxokavarop.22web.org/dlink_ac3200_price.pdfIn PDF document text
    • http://sorulaxawo.iblogger.org/memrias_pstumas_de_brs_cubas_filme_completo_hd.pdfIn PDF document text
    • http://bavedibigilomit.66ghz.com/resoluo_castellan_fisico_quimica.pdfIn PDF document text
    • http://rafupufubed.mypressonline.com/edgar_allan_poe_free.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/58816387863.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/86290685766.pdfIn PDF document text
    • http://nakezubelakibe.22web.org/avast_safezone_browser_apk.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/coronary_angiographic_views.pdfIn PDF document text
    • http://bolipoloweda.mygamesonline.org/13210008901.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/footloose_industry.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nofolimuri.myartsonline.com/josopizulogerepareme.pdfIn PDF document text
    • http://najexenij.onlinewebshop.net/sejarah_ideologi_liberalisme.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/27249350805.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_12185f89e60147fb8c4f235f002561d3.pdf?index=trueIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/achieve_ielts_2_english_for_international_education.pdfIn PDF document text
    • http://ximolamerojizud.epizy.com/manchester_united_leicester_match_report.pdfIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_6b001675fff242499134450b874e2717.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41650aae-d853-4055-9502-ae7d533e89bd/32498471916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67eccd42-88d4-4d6e-913d-2cae7af898be/can_i_use_python_for_machine_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdf0f5d-ad21-4579-959e-035a16cfb856/how_to_write_a_covered_call_option.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ea1cea-33cd-48ca-b2ca-2c0fe167ce4e/allpowers_100w_portable_solar_panel_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576e4369-1ae1-48ca-af63-19197f437ae5/sony_ps-lx300usb_stylus.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_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 5164 bytes
SHA-256: 0aef5d56772b10b2ffc1f3af5c3afec6775e5b4e47acc3b8a00e9d9d3e5a6fd2
font_01_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 11492 bytes
SHA-256: 2ba129aadfe0182d94bfce78ef589d9fdc6cf41a97c612a805401be062709bb1