Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8de98afd0b83aa…

MALICIOUS

PDF

75.1 KB Created: 2021-03-01 05:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a5d893faf50f518198dc5a66c3fb6f63 SHA-1: 52962b4ef2b6824803728dc1e95397b5e99cd882 SHA-256: 1a8de98afd0b83aa796a4d7fd8212d0acea6ce79dfff99272031f55b16c21f47
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 0.9996

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/123?utm_term=nato+alphabet+meaning+hotel PDF link annotation
    • http://nigasheff.xyz/is_google_digital_marketing_course_goodmljxu.pdfIn PDF document text
    • https://bulipegorevuju.weebly.com/uploads/1/3/4/7/134700868/vaduz_susuxik_bizatuzane_jenodesukexi.pdfIn PDF document text
    • https://tigopovon.weebly.com/uploads/1/3/4/2/134235173/vopakip.pdfIn PDF document text
    • http://trackcreditscore.info/23046479028g2nhf.pdfIn PDF document text
    • http://creditscoreusa.info/top_safety_rated_infant_car_seats_20193bf4a.pdfIn PDF document text
    • http://ehaberdevlet.com/11979371133ku1os.pdfIn PDF document text
    • http://braco.ru/bts_flute_sheet_musiczl1yb.pdfIn PDF document text
    • https://fewabupa.weebly.com/uploads/1/3/4/5/134584226/gagomogovoti_vudama_dedoxokog.pdfIn PDF document text
    • http://nyvelsets.online/ruwuzutovib4bub.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/5052801.pdfIn PDF document text
    • http://jnatural.space/definition_of_global_marketing_information_systemkxei4.pdfIn PDF document text
    • http://requiredjokblog.com/duzuluwofototebajegakanb0ar1.pdfIn PDF document text
    • http://philonio.online/77775701292znppt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunitugi.rf.gd/11478963009.pdfIn PDF document text
    • http://rewifavad.epizy.com/52491628992.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/alternity_gamemaster_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/ruvemibudinejovasuxojev.pdfIn PDF document text
    • http://dimesagir.epizy.com/jisukatofetemepusepili.pdfIn PDF document text
    • http://zaxawogaxema.epizy.com/durostar_ds4000s_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/agro_informatics_define.pdfIn PDF document text
    • http://pititonekeget.epizy.com/55032711517.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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 5068 bytes
SHA-256: aab949d04c11687daccc61588ab8a3e1a7e389be92cef7371721e231e1dfd5e9
font_01_sfnt_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 10428 bytes
SHA-256: 2c747809b625b2d6b117eee78b539418c330d950e252f616ec482de12e4e1f1a