Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcde11f779a17eb7…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 17:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd661c17518d1b9ebd0334b3c03a46b3 SHA-1: 8110863959fca8d9450c0d2d6f24473e9cd69316 SHA-256: fcde11f779a17eb7e14c228e7abfc7aed65d6e067682045c272438da24e41674
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs and a heuristic identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious workflow designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=sniper+warrior+apk PDF link annotation
    • http://files.ibiza-ferien.de/file/zetosatowatesetopiji.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/44043067809.pdfIn PDF document text
    • http://yuha.be/_files/file/sutezazakug.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/5951732427.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/rokawugibataguwin.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/18053259179.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/97753870046.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/90996557976.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/bekizamefas.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210905002930.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/58066647723.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/fajugomorezetofisusabile.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/80506145243.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/39258099836.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/jadulerolirep.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_0553ABFFBA6D47D4.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/46523137827.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/25767280601.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/jasutilatolufi.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/49152978671.pdfIn PDF document text
    • https://tomas-music.com/contents/files/noxobuzijogidevamelew.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_off0000d0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 17756 bytes
SHA-256: d80030485b30272c03f62a74eb8f00675078057bd6b275b38634877abf3dfb92
font_02_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 10188 bytes
SHA-256: f2359bb545e1897b096fad55e168fc89194299befe0587c92788ae66007d28bb

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