Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bdd72ecb1b9afb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-21 21:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f274a19bdb027da4c13cde716ea61b55 SHA-1: 93383e34dde92259002e6b692aae29e4f18feeae SHA-256: d1bdd72ecb1b9afb01dea4cb347a0b024332ab85c70160f0dd9615ce0cbc44a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://coretry.ru/uplcv?utm_term=simcity+cheats+android PDF link annotation
    • http://fixafilm.se/userfiles/file/pemilawukepixese.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/xegoxotasonanenolubuvaf.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/37493971168.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/59109281685.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/15558071657.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/87531487566.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/guwojinug.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/1409874763.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/73796398227.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/gusigaresolaluvubonuzamo.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/94375488021.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/92669150298.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/83655961605.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/96992976424.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/mezewi.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/romometupafumopaxa.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161462706c2f9e---60466422500.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496a83bdb8c---96295734849.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/73106221667.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/966590820.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/34013365909.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/77468362213.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/65589674698.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/96336895185.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_off0000b246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB246 16380 bytes
SHA-256: b923eddb5fa38b3f4863437ad77718518d4d3222720824472ec5055daf6c495f
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 10780 bytes
SHA-256: 3123b49d6e6c7230367f1217d0555b45ec22f43feb1a64c754d04da3ab6b1102
font_02_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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