Malicious PDF — malware analysis report

Static analysis result for SHA-256 40150c402a498f81…

MALICIOUS

PDF

83.6 KB Created: 2021-04-16 08:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa17fa7d562c0ea16f436e391aa12602 SHA-1: 18e77950c54f9e6534fe0e2fb8ff34375bf62d82 SHA-256: 40150c402a498f81b0b893374b6bea36474661ff318a858aa5bdc535d82b722c
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=tabela+fipe+carros+usados+ford+focus PDF link annotation
    • http://golixudib.mypressonline.com/ketolukulajated.pdfIn PDF document text
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/luropijuruxuwet.pdfIn PDF document text
    • https://bitipobigexu.weebly.com/uploads/1/3/5/3/135399459/kixax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_6011d05334497.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/7475962.pdfIn PDF document text
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/kitunumuxumu_pudax_devuzivesik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415530/normal_5fdf2f65316fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_6003417173385.pdfIn PDF document text
    • https://kibugaduxabe.weebly.com/uploads/1/3/4/5/134510017/rijuv_totezipuxat_kugirepa_wufek.pdfIn PDF document text
    • https://lepudumewo.weebly.com/uploads/1/3/5/9/135962044/5239173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406806/normal_5ffbc84adcea0.pdfIn PDF document text
    • https://lopodegif.weebly.com/uploads/1/3/2/6/132695694/vezadonemevenilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_6010121dda8e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420036/normal_5ff84f0c9c04f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_6024209db65af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozore/suxubozinamum.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/consulting_industry_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/fujixajime.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/analytic_geometry_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/camera_raw_7_cs6.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_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 5236 bytes
SHA-256: f0d31578dd43804639c9e9f86e7b207e1c68a32b9c7171de25005647eaf175b3
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 13124 bytes
SHA-256: ade70e3070573073c3ac34aa4a89c52febb3334425148ee366e7b1ccef48b0d5
font_02_sfnt_off00012999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501