Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3382ca996c2887…

MALICIOUS

PDF

85.4 KB Created: 2021-10-05 16:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0cf136b12bea9e4175d79deb6b7bf300 SHA-1: 939e49cebcf0ccddaf76cb2e349876fb66ed0dfe SHA-256: 3e3382ca996c2887959e465b39b31522097d2b0c0abc651ccdcfeb9363d9869b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1534 Internal Spearphishing

The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' confirms a credential phishing lure impersonating Microsoft, directing users to a suspicious URL. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://chcial.ru/uplcv?utm_term=1+bhk+house+plan+for+east+facing.
  • 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://chcial.ru/uplcv?utm_term=1+bhk+house+plan+for+east+facing PDF link annotation
    • https://jamurgoreng.net/contents/files/pajuzuxugemag.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/36196015428.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/61870736227.pdfIn PDF document text
    • https://sergiomauri.com/images/file/difodute.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3b421beb---18621659014.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109260030503639.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/beperefuxa.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/71693455549.pdfIn PDF document text
    • http://jsdarvin.com/files/94230390255.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/zubixanelapikezotokisad.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/miwotom.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/2883469647.pdfIn PDF document text
    • http://rrarental.org/upload/file/xenujejibi.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/nabesigegopobidoruxodogis.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/vijadobukidogokasanifex.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/povaxipaseduvewal.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/kuloribokedulurulile.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/fabipu.pdfIn PDF document text
    • https://drlanda.hu/user/file/kijunipemibikededok.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/94452708689.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/xedibidarojelifowe.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/71734972893.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/52132368917.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/37498689888.pdfIn PDF document text
    • http://szhlfz.net/upload/puvumu.pdfIn PDF document text
    • https://kaparatt.com/images/File/tovunidasebozaliz.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/wugosekoxirivi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 19104 bytes
SHA-256: f7714c9f2341b16d05f1fe806ae5ed700a0befa8cfca1babe59a01c6d27e101c
font_02_sfnt_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 11048 bytes
SHA-256: a4d0c0a446c49b89df22c83d6e502f5b58165f8a80da4a9927118b349a4fd8a8

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