Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b0812653b85fd5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 14:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc088e266d8858c95e8bd71768c86b98 SHA-1: c328436a01ab67a2f0be8d1c26a64b773ad0d357 SHA-256: 73b0812653b85fd59dde5e4a580be845230f14054bfdc82ff096855ea05b1f56
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are algorithmically generated and point to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or phishing for credentials. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=trova+il+telefono+android PDF link annotation
    • http://koala-al.com/d/files/gazugan.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/dosorufu.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/92148728393.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/75969227750.pdfIn PDF document text
    • http://geoman.cz/data/file/63654161736.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/72637546749.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fuwerumuzewazetofop.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/lojilolav.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613470c7ddb36---fopuz.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/23888327786.pdfIn PDF document text
    • http://bulmarconsult.com/files/juwutavebovutesetinixevul.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/togedi.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/girotajofakogufi.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/54662865015.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/ralanerex.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/80624228938.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/66907126485.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/26553972701.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/72632446235.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/purasorojiwuxozesitaseveg.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tukodomobiz.pdfIn PDF document text
    • https://renetravel.ro/images/files/62828152700.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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16980 bytes
SHA-256: 24cb3f9939ab42fb471695e54c786340da180a4d6069dc017c89ec08c191f8f9
font_01_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 10208 bytes
SHA-256: 5436224c5923015a72274fdc1bc6f842807d365dd50442f255b558cc5a7b2118

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