Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c1adc9332183f7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 12:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ff8a7199d9c5ef04e10e61015bf0a925 SHA-1: 4ba40a06f19e589a44ded09e0faba1ef5cd8855e SHA-256: 77c1adc9332183f72cc4efdcaab7efdd44080bc08e982fc9d15000d51ed4ee6a
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 0.9990

Heuristics 5

  • 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 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://krisoc.ru/uplcv?utm_term=a+quiet+place+2+watch+now+free PDF link annotation
    • http://self119.net/upload/userfiles/2021/09/files/210908072432.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/77642407589.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/xolokuxusukuxebuxaraduta.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/lewemeninaxib.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/modajonafozivovumi.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/sojisamujapesiraruwosi.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/72612738620.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/mixefawedugutevan.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/4935934875.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/sanir.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/91659212300.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/95531665135.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/78449528838.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/6217725447.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/suwagebitomudafazap.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/22126581067.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/mugimil.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/sifofotilumepowuwefavuw.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/xalodetupemevopeka.pdfIn PDF document text
    • https://interconformity.ro/images/file/tasowovovegujazimeti.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10840 bytes
SHA-256: 5d382da6ce89163a8e268294c44901bea178bde0d431609d006d9e06233b862d
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 18944 bytes
SHA-256: 39c15b3f48d6f9a920470459e4cd7dd50170fa6aa95f1c08559ea525c7c2a4cf
font_02_sfnt_off00012945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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