Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7de12ebce70403a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 22:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc08a39bd1aa6228a8cb69af12436243 SHA-1: 0653bbe0a0298aff70c957c940ffcea3e093369b SHA-256: a7de12ebce70403ab223d6d92b854dc816d5e48a22e06987747b862dfcbe976a
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 and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=inspirational+words+beginning+with+e PDF link annotation
    • http://minerva-collection.net/files/files/34635124974.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/sagavulorugajabemogivoteb.pdfIn PDF document text
    • https://hsse.cl/files/jixifuluz.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/52932619660.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/zanokeletiriwofupinanupo.pdfIn PDF document text
    • http://isosklo.cz/uploads/gojuw.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/8169660888.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/31145440303.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e74aea869c196225084db8c191042a01.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/dumogavokewinatodijinin.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/36235018603.pdfIn PDF document text
    • http://boldogelet.hu/media/jebowafazemibareta.pdfIn PDF document text
    • http://industrialdevices.in/uploads/65660137630.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284f773acf---runimexasexer.pdfIn PDF document text
    • http://w-mill.jp/images/file/5935190011.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161301eaab2f65---60144901347.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/kitugebixej.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/jilaxisanefujoraji.pdfIn PDF document text
    • http://congluc.com/upload/files/19054604331.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/44039113322.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/mozotajupejez.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/jijolu.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/4079645888.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_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 17168 bytes
SHA-256: 63b08bb8b1611cdb9d35cf7c1f81203b6a3c8984f77e24ff8f7e8682da23ea6f
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 10848 bytes
SHA-256: ac38985c9cc346dc1b0fb80be9bce1484fce2043a8d4d887e413c1ec2c8d4a38
font_02_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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