Malicious PDF — malware analysis report

Static analysis result for SHA-256 05150ce1832a6253…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 09:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6673cc07332cf2c4284fdb1e2a5aff60 SHA-1: f4b295c5abe1972fd76982b1f7055e61883bf608 SHA-256: 05150ce1832a6253c545d4723e330e70fcc29770a1fc31dd88608b69c8eeb854
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and uses a QR code redirect lure. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=notification+missed+call+android', suggest a phishing attempt related to missed calls. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=notification+missed+call+android PDF link annotation
    • http://vitacanes.com/uploads/files/putalisog.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/72036294564.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/59689820657.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/jevezamebuvovupo.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210912_750e1.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/44957851235.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/76520128121.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/44225029740.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/bapurobolesivotexufetam.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912145834551941.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/tigivinawodedelovu.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/zipatotubazofoxikep.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/depiwapoliwazaxitija.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/besemedufasokelirigudexo.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/23101722075.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/xafanatolobugiviputukam.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/nidetupukusudo.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/63243840919.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/mexugeferotatexi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b098f870---ginepanilebizag.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/rixakepesorolav.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_off0000ae47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE47 18188 bytes
SHA-256: 26973cf18f24b6e91aae194b8078bd086b7d8dedbc1db2453372172251f68281
font_01_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 10616 bytes
SHA-256: aa855c3c5f792e7be194c39abef4b42ccbeda40f1ab94f70e603655fbebeae71
font_02_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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