Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8120b7dc9ae884…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 19:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 185ce547728b2315003422085782536c SHA-1: bcba9308c2a9307ce228beb8d1dcf6ed055279f0 SHA-256: 1a8120b7dc9ae884ffbf4e748c095c9d1c154a2ef708a24788c714f60f7457b3
134 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting. The presence of external URIs and the overall structure suggest the PDF's primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=javascript+programming+questions+and+answers+pdf PDF link annotation
    • https://hizlipin.com/calisma2/files/uploads/63159724988.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/70258281456.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogilomekixopupajigenoj.pdfIn PDF document text
    • https://capecoralliving.com/media/file/favedawuzomebojatelugepu.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/begadumizil.pdfIn PDF document text
    • http://palami.by/images/file/ruwepojove.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/75344740301.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/10064898963.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/zanidi.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/rixakovimuzimedinajew.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/wifomizowunapatela.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/86670321818.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/xoduvowinitisisa.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/83760175026.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/fedijagujukebosudedat.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/36662182632.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/15098498761.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/9959966304.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/93384345334.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/87158174366.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_off0000c1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 17276 bytes
SHA-256: 34fe90817944d62e42ebbc7c2b70ab998c507a9d0c6a839ed16c708892523016
font_01_sfnt_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 11304 bytes
SHA-256: 9eabb90dab9f496d9988edb2e49d81865578a38eef326967bf3269f7cf8eb1f9

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