Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e8a131ac74c16a…

MALICIOUS

PDF

81.7 KB Created: 2021-03-08 01:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 351d059a71517935f3773c983a8db4c3 SHA-1: d1f894379ddfc6d2508c56a9869c9658e3df5773 SHA-256: 75e8a131ac74c16ad2517b84565eb78c06b559307756d94ef3c7a64805a6f7e2
186 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. 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 0.9997

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 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.
  • 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://dugedepap.ru/strik?utm_term=what+is+the+theme+in+the+poem+i+went+to+a+party PDF link annotation
    • https://cdn.sqhk.co/sadirorig/uhfiage/glitch_photo_effect.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fd28f6e55cf7.pdfIn PDF document text
    • https://cdn.sqhk.co/mifebemige/dlAtjf2/zajevukizepukodafeloz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5fcf14fdd718e.pdfIn PDF document text
    • https://cdn.sqhk.co/refuvowur/ageDPia/gokanakoxajiketotigatavi.pdfIn PDF document text
    • https://gixosakovi.weebly.com/uploads/1/3/4/6/134677645/wenunuvavopegilevi.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/8zN8gfi/bike_racing_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5ffe1b76a9f7d.pdfIn PDF document text
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/foxesetuvuge_vikejuwotedit.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/hehi6NU/iphone_browser_bottom_bar_height.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/Lijidib/swamp_people_troy.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/iejaje3/twilight_struggle_board_game_strategy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489263/normal_5ff6c37707464.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/eMdu0xa/boo_at_the_zoo_bronx_zoo_discount_code.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/lggidid/samurai_spray_paint_2k04.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/satodakex-jepajowopa-nasopiwigojus-vixirukogop.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/ggtpjut/2043309748.pdfIn PDF document text
    • https://momaduse.weebly.com/uploads/1/3/4/8/134895420/tifuketavepipidevade.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://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_d48e9761475349cc8c6acb52abf91e1c.pdf?index=trueIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_6244d5df4494405d952638b70f1a1b81.pdf?index=trueIn 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_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 5024 bytes
SHA-256: 2fd53d2ea70eebd98ab36135ac55d6dcc397870e2920d6cb90e90e6b2460a63e
font_01_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 12792 bytes
SHA-256: a1ba9d19efb4799313f8a260686074e201bfb56c066dee8b005590cdd4cd7ee6
font_02_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71