Malicious PDF — malware analysis report

Static analysis result for SHA-256 a456bebb00fde657…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 12:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28d4548dfdace579039f3b58ce95df34 SHA-1: 20763ccfdab505b3bab4496156776c3739dad61f SHA-256: a456bebb00fde657edde93d1cdc7e44b94cb39d20bb3faf7e9967c188d4148ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be disposable. This suggests a tactic to distribute malicious content or phish for credentials by luring users to click through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://htwy.com/upload/file/45799316479.pdf In PDF document text
    • http://choinka4x4.org/cms/files/file/91322159308.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ripulikaj.pdfIn PDF document text
    • https://ntc-container.com/upload/files/72855499562.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/57987483168.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/37459790742.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/48129186445.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/maxatixixotewuleri.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/94583145060.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/40488628949.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210910134931.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/dewagezaxaf.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/takatezuvilakinojewevo.pdfIn PDF document text
    • http://nenorm.com/files/files/gasidip.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c09d5cbbbf---89599999309.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/bulirudedaxuv.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/zonepodatotosemu.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/niwexogelilu.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/wapugeveturebefunip.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/80532438967.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/lanulijogolageguniweruvu.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/86232032968.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/39512362772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=to+change+this+permission+screen+overlayPDF 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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 17856 bytes
SHA-256: 06841b2f8f2efb19619c6356332a304969efd04bc8c49c56ca15dee14e183a3e
font_01_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 10964 bytes
SHA-256: bbf8840efdf1f38d5124b6fdb0eb67680e5a86b72ee20520fe8036bb7ac7f595

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