Malicious PDF — malware analysis report

Static analysis result for SHA-256 0254aa86f64ab64c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 04:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85833efa1c6cfffade6e989c06573cbe SHA-1: 964c056e70c9d8280eb967cca84b1aed409839e1 SHA-256: 0254aa86f64ab64ca4b8e81e647c4869f7fbb9e69449a4fcd2414192e25b9a72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://evolution-dev.com/file_media/file_image/file/28704064992.pdf In PDF document text
    • https://blogsma.com/files/migifojalirufuvexeren.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/35412811201.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/nawigukoxep.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/vukuvotokililuwofo.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/mejuzuv.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/gurizosu.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/84326871178.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/55365518307.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/81580240988.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210902010408.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/883952013.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/64508633535.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/fewapoduloxolatob.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210910/0509326839.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/timaluf.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/vilomuzesixususadi.pdfIn PDF document text
    • http://unsersohn.com/images/file/79028919445.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/tukejo.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/23282226251.pdfIn PDF document text
    • http://esejsc.com/upload/files/98643031411.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/6900518189.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/foromu.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/pefoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cool+cleaner+app+reviewsPDF 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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 17184 bytes
SHA-256: f737ec2ad8c0cac91418d60a611aee8ca7f1e37b12b09c2f77cd223a40c5d6af
font_01_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 10452 bytes
SHA-256: ade764c29303672df4ab0dca04e83f68434835c3c3d083c289d7254c008c287e
font_02_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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