Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cd78f51a78c96b…

MALICIOUS

PDF

83.6 KB Created: 2021-06-08 20:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e885ed343bc6062aad465c982a58540a SHA-1: 9445af4b5d8108ce5722fc7269e948eee6c90a83 SHA-256: 73cd78f51a78c96b0386e2d476edb83cbfa72f05a8cf29a453f4792f5a5ab3cf
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9994

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/pbw?utm_term=tu+banco+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499309/normal_6003a372afde1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_60bb06051de82.pdfIn PDF document text
    • https://polafepunulud.weebly.com/uploads/1/3/4/7/134718340/kijinesafalo_banerezole_nimofurak_rofimuxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418781/normal_5ffd4053715df.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/2203542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fc613cc9281c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417214/normal_60b3d7d714c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_605aadca9a0d1.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/dd102.pdfIn PDF document text
    • https://kisupijun.weebly.com/uploads/1/3/7/5/137502160/sadudasavufed.pdfIn PDF document text
    • https://xogudefimo.weebly.com/uploads/1/3/0/7/130775634/bumuvaso_tojuromegoxon_sidebasav_fijirar.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/c366240d-6d7e-49f5-9b09-f1ed71c732c6/introduction_to_econometrics_4th_edition_solutions_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8476a5a-0e5f-4ee0-adb5-1785c574fcdd/32534240709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c60437-9420-43eb-9347-7e1c04e049b3/jofoluvemurinubujozewug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e478e21-ba12-4556-af52-af135625ddab/61686425404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a939abc-d480-467e-9c61-0eb9eb340e69/how_to_use_chi_hair_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e255b0f-9244-4e71-b9e5-5e0b11ee1ca5/wusekewebusowokadot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbeeacbd-ee8a-4013-902a-a7911bdd57a4/letra_del_canto_me_gozare_en_tu_presencia_jehova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a287c6a-d077-4f19-b4c2-f3ee6e412477/81433021848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c57aa9-2599-44b4-933d-99f1508fe85f/zetoboputabolopukopuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9794c36f-d1a7-4000-96d3-80af08f29b5b/3d_horse_anatomy_software_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688473ca-35b2-4e8e-aa2a-92bba2515ee8/zekasudugifasufesixaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b10e8ba-5307-4725-8dfb-c8dc6e6c8714/comparing_plant_and_animal_cells_worksheet_answer_key.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_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 4608 bytes
SHA-256: c0f60b2d307abb6ae2e1e0eb3ef4580001075ef722583a1429dc38120d04ede6
font_01_sfnt_off00011831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 12352 bytes
SHA-256: 3f9c3a239de0239b34846345c266ba0599ebe4c947fa2a2cb268912b0daa04fd