Malicious PDF — malware analysis report

Static analysis result for SHA-256 9376232613ca6487…

MALICIOUS

PDF

86.5 KB Created: 2021-03-27 11:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 90399f126e3727c34f73ae5602253d81 SHA-1: 6bb162d206e5f32cfbc29256e4c11c8277178b1e SHA-256: 9376232613ca6487ee4db99ab9984abdc1a3f8ed156a0b8a50affe0fc1e12dc6
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan distribution attempt. The presence of external URIs and a 'download button' heuristic suggests a lure to download further malicious content. Although no scripts were explicitly extracted, the PDF structure and associated URLs point towards a phishing attack designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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
  • 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://pelibifir.ru/award?keyword=bl+theraja+basic+electronics+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452626/normal_5ff82ef4a921a.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/01hasic/crew_app_customer_service.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_602f7e961654b.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/7ehfbjH/walmart_moneygram_customer_service_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/6iijbyT/jonepuzuvanalovajupunejo.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/djjohak/lofere.pdfIn PDF document text
    • http://select-get.top/79810853177i6vkg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_604d87a1a2ccf.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/jhcnhjU/ice_cream_and_cake_birthday_cakes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_6022afe9dc8d2.pdfIn PDF document text
    • http://astropsychology.website/8951718130256geh.pdfIn PDF document text
    • http://delayikapy.xyz/91141905964yz6nn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_5fd78b1591068.pdfIn PDF document text
    • http://excschool.ru/fiduditajutiposowowuvozoujft5.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/d1lBVLd/voice_lessons_online_zoom.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/chiuqkU/87132991266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d95a3d-c5ac-4eaf-91a1-ade6021f501b/74293930865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b8aae6-d686-4fd4-be32-0d7f66e6ddbb/savefamepakimuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fbad94d-a021-409e-8547-d12b28596dd5/how_to_pay_interest_on_late_payment_of_esic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739f0d99-c1fd-402e-b332-6b0e0d95e1d7/nail_salon_open_at_8am_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41052b66-1516-4ec1-a1ab-9e2509cdc0d6/charlas_motivacionales_de_seguridad_en_el_trabajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b0cf89-9876-49ea-9066-760a4445d375/rumupukikid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c690dd9f-2089-45ff-b3d4-64b4b2da9bac/jaybird_freedom_sprint_bluetooth_headphones_how_to_connect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054d18a7-2216-4be2-bbd1-3bbcf6031a83/refim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7100c569-56cb-4bf8-9cd0-f371458a1ee2/ritetemp_thermostat_8035c_touch_screen_not_working.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 5600 bytes
SHA-256: 4197338af98b7a7411dbbb2b6097de86fea77e4a9230c32ce14bcc2b8e87b53d
font_01_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 11576 bytes
SHA-256: 25c13add5be2d530b9a53c639591bf1c1282dfd7205755a5bd3f63cee6a5a5ac
font_02_sfnt_off000136cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CD 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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