Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6383a8bce3375a6…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 13:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e0c04b4f514dfd95a2f99ac57ef81e4 SHA-1: e5337e2d6e89332c77f254aff0546a4d230f3b89 SHA-256: f6383a8bce3375a64ae1e7c6f7dbf38a5a8c530d1cae8f67d23658ede18dd3e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=kinemaster+bg+video+download PDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d722f58b5c---32816269369.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/sozepekuwewosipa.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/dafofinupubikupat.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/mejuvudogizeja.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/bebokaridew.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/regexi.pdfIn PDF document text
    • http://tvsporedi.si/vsebina/ledafoz.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/farivos.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/pamolenigapetalo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/26785619447.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/64298092331.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/66342970178.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/xifub.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xodajegobaxokenugufej.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/tikupatikimezaboziwa.pdfIn PDF document text
    • https://verner.lt/images/files/kezul.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/47831515666.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/29292696014.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/xomenikokaza.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/78782723049.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/jebatonogisalumadumurif.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/jerubovese.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/jezimiwibufosabodufuxidu.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_off0000afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 15004 bytes
SHA-256: a8e3eb5195ad191a381ab385a11d8a499da0299ad59cc15aefc6dff4909997f4
font_01_sfnt_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 10876 bytes
SHA-256: 498559031a3512de9856a8c9adb6482d670fb91d902aea5a222477b1734d0ca9

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