Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47fe9cf34a3bfa1…

MALICIOUS

PDF

90.8 KB Created: 2021-09-14 06:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c439ccfeb10704f11b8d0e2a547834a4 SHA-1: f3d1192dce3d8d04b2324800c817e5fdcd16f06f SHA-256: d47fe9cf34a3bfa129897716254aaeca1d51bf49815637a6708088f00bc8208d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of invoice-related language suggests a lure for phishing or scams. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs, including one on a disposable host, point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rajnnuhiddje.se/userfiles/file/41071904191.pdf
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/97671962041.pdf
    • http://dyccpharma.com/upload/files/95092360733.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/sugerekuxakuv.pdf
    • https://mertlakustika.cz/images/pages/file/57824773239.pdf
    • https://landatur.com/files/galeria/files/ziduziv.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/68231504237.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/lewizonetixuf.pdf
    • https://tagoproperties.com/ckfinder/userfiles/files/jejoluzajerululo.pdf
    • http://neoclassicalmansions.com/uplds/file/96203067700.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/97156136475.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/4865259.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/zusoxisomawipavarokexodaf.pdf
    • http://exima.kr/userData/board/file/21116721090.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/kizegofikatonepadesotif.pdf
    • http://methese.com/upload/files/29084493101.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62978874752.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140089f5d327---loxuloduru.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/gudibixobetiwukikasa.pdf
    • https://nusbetaja2.com/contents/files/89154806598.pdf
    • https://estoniapools.com/contents/files/voxezirifitev.pdf
    • http://bebaldebaran.eu/userfiles/files/bapuvotajume.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/fufadux.pdf
    • http://arebiatours.com/uploads/files/pibepemalosilujefekalol.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8f11f0306ac9dbabf57a3612bc7acbc0/pugezakizike.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+document+viewer+library
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd18.bin
d39fd455aa69356a42cec6787b89d78ba960a49b893b2f438e72eded3dae2a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 10848 bytes
font_01_sfnt_off00011636.bin
c65a8d62247158afe4689565397d0c5da2284ed22b28975c49eebc370c3b5f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 17956 bytes
font_02_sfnt_off000145d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145D0 16792 bytes

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