Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a555453751bd9c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 06:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dfa63b35dacbf060ff69b2526f8bbae SHA-1: fc0e526e57747dc3f955105ee3af73b9b007832b SHA-256: 42a555453751bd9cb8043ce4d62d24e405f0805cbfff3a2748f3d9013e8f07b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links and a visual download button, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious link farm or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sp2wronki.pl/fotki/fotki/file/94677772504.pdf
    • http://zhongyuemedia.com/filespath/files/20210901232526.pdf
    • http://telecycling.org/files/file/xixifarem.pdf
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/79138773056.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4eba070c---zosemezedakenew.pdf
    • http://elateridae.com/images/FCKeditor/file/zevuxud.pdf
    • http://tabouligrill.com/ckfinder/userfiles/files/93206763781.pdf
    • http://sbkf.org/files/files/18751460517.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333bfad14fd---21248970263.pdf
    • https://turbooto.vn/upload/files/40172094551.pdf
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/loxelevawopode.pdf
    • https://securitydm.eu/slicice/file/dijupodogegenewi.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/fasexivudi.pdf
    • https://eltechma.com/zdjecia/fck/file/64922540810.pdf
    • http://harissarantis.com/userfiles/files/texomakeneloruwaneredakaz.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/16335934044.pdf
    • https://stabiactiv.com/userfiles/file/8606146086.pdf
    • http://ambvetesopo.eu/userfiles/files/47218734561.pdf
    • http://zatacorp.com/upload/files/vuzowe.pdf
    • http://stin-verdon.fr/assets/Image/files/mowedifaludonireregil.pdf
    • http://1544-7419.net/upload/fckeditor/file/kizubelapinamurarunamafo.pdf
    • https://cplastik.com/data/cms/file/15581926577.pdf
    • https://orrizon.ru/images/file/58510862601.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=androdumpper+old+version+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e541.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16792 bytes
font_01_sfnt_off0000fd58.bin
95a0dd33ef3d828903a9a108526691271567eabdec86d130533c2728c79b2d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10780 bytes
font_02_sfnt_off0001162d.bin
5e3f138200033d817a0a0377622d54bfcd6688cfa9eb77d59fd7ae74cbb4c75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 19656 bytes

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