Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86af47d77f2ca51…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 11:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45c45787cf06f0fe1e3b5e2e5ffe240f SHA-1: eb5f17e309a49f6375bea986943fcf61151aa711 SHA-256: a86af47d77f2ca51dd1cc2539a9bd82711d47909f7022a02ceac955898fbd93d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The file's structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=free+fillable+forms PDF link annotation
    • https://impulsa.mantareys.net/uploads/plantillas/files/20077061218.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495517b0d92---fojodixixunewusimalamit.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/30440038698.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/19146898114.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210918042617319.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fifududivumexovegu.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/69187148680.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/20710271704.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/wosidupuvafokozakibop.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/tazidofuzutoso.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/73870519342.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/37238650505.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/zixup.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/93755695659.pdfIn PDF document text
    • http://journalofcritique.com/ckdosyalari/upload/files/sexonazojusatuz.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5gud37mn3ludjsmlg37q4cqgq7/19147386300.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/ruzubonigujurupepe.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/16618293600.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/wexuxutupelozijuf.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/35897738545.pdfIn PDF document text
    • http://chp-travel.ir/data/file/21069452300.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/gibivo.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/4649124450.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/48264719425.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_off0000b28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 10288 bytes
SHA-256: 698b900898f7ffffdc2bbdf90b60783a87842843ebe17ccae6d802be58670f0c
font_02_sfnt_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 14840 bytes
SHA-256: 9b874501612d59900a49cf275cddeb0e64fb2159caf7488e8e1ac4221414b158