Malicious PDF — malware analysis report

Static analysis result for SHA-256 4771e7aa61df78f5…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 00:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5737552f16388d6b9d69e20f04cadd2f SHA-1: 2cff38249d6fe0bf06799e7982ab47572299f92b SHA-256: 4771e7aa61df78f511dcfc6f345f86f6324b0fda3de8ea26470a12c989215a91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm with numerous URLs, many hosted on potentially disposable domains, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/doxebafuzomazim.pdf In PDF document text
    • https://latgalesamatnieki.lv/files/file/nibujajel.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/63782657021.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/59555449017.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/patapetuvoxuwiluparowu.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/56950364336.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/burawujesefabaperoxeworu.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/98023342590.pdfIn PDF document text
    • https://megashina24.ru/files/files/62975860741.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/rumepapokikarajomu.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/sikoxitadisunawefew.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/zatikaxado.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/37861923168.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/gumamumixutofa.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/64539890299.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/46256267545.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/92275101662.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/471076246.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/sutirakuwepav.pdfIn PDF document text
    • https://emenu.hu/editor_up/75290976792.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/33124706787.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pisadokaliduzabejo.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/soseluwezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+create+time+lapse+video+on+androidPDF link annotation
    • 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_off0000add5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD5 15560 bytes
SHA-256: 772dee32201089b101a78f5365c1d71e9709d5682e369e94692ac61de9a5d450
font_01_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 10820 bytes
SHA-256: f74d5f3c8536da719f36ad9d3d29f5a8163ee494c528776072107551ef299727
font_02_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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