Malicious PDF — malware analysis report

Static analysis result for SHA-256 8056c272a78c1c50…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 11:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a80226c9aa414791d2cbbfa81f43075 SHA-1: 8914d7bbb988e3a9c814a2ca94f3efc9291ee360 SHA-256: 8056c272a78c1c508def382439dab0af9c6387af624d34ea7bf6b87b5a377113
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including one pointing to 'synerhu.ru' with a query parameter suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links to disposable hosts, reinforcing the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely serving as a phishing or malware distribution vector.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=always+be+imposter+mod+apk PDF link annotation
    • http://yourbuilding.ru/userfiles/files/rijojuguromafilitonodavor.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/zazim.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/91877363555.pdfIn PDF document text
    • http://idcla.net/upload/files/79900469865.pdfIn PDF document text
    • http://erpos.sk/data/files/vizovaperujuvutujolikopeb.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/47473343076.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/vizetupofiso.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/fitatagasejepep.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gewizowijedavo.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/lovetadirowasokozofeparew.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/30083728872.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/8957699682.pdfIn PDF document text
    • http://labradory.pl/file/resotekewopamatugopeg.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/mukoxewolufusokojexiwalaz.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/tidoxiderud.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/13404840492.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/mosilekorufubexep.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/27289998915.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/83910466638.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/folebidiwiditabujijo.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/xopetogadukizuvuvux.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/dozububasubafokapokizaf.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 10864 bytes
SHA-256: 69c597c63435a5ffb65be4b173ce244f699dc160840ea652dc64a1555177fa7d
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 19796 bytes
SHA-256: 764506c5d0b9c95fb5b4e032a59540ed66d5e343c887a2f7871c232f638582fd

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