Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f55fa08e208b17…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 19:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2d548339143ab49a9c0fd7ee109a74a7 SHA-1: d7dccde1eea87b9a3ed1168f2b55837c5415b08d SHA-256: 29f55fa08e208b17f16d022af7e8695a2094293990a4f1bc889848b0595300fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=emulador+de+sega+genesis+para+android PDF link annotation
    • http://prepearl.com/uploadsfile/6018948977.pdfIn PDF document text
    • http://wdnederland.nl/file/gejexej.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/98028792012.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/12584290528.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210904151241.pdfIn PDF document text
    • http://origo.ws/userfiles/file/47844378007.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/43290166092.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/bafinomonidubaviduti.pdfIn PDF document text
    • http://tortugafilms.ca/adminfiles/file/dafawifexaz.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/49405009231.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zesawodazofizepirep.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/liwupevodovotudane.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210907072433863828gmo46y.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/69685290512.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/ronifunamexuxuvo.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/42556584644.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/voriwisipezajaxitera.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xokuxubozoxivodexifi.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/46570811846.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/fasevelobixenijonof.pdfIn PDF document text
    • http://beta-rc.com/upload/files/tuwenawesuli.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/84445790602.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/sitejawuramored.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_off0000c3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D1 18056 bytes
SHA-256: 601c0514f945db4c144e63cfcb7260760faee55e999fac78146bf94dbbf771cd
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 10720 bytes
SHA-256: 42cb125d6b3f64610cc221a38c0670bcd7efcc248df690032700592ef189daef
font_02_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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