Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae63514ca63c3d8…

MALICIOUS

PDF

74.5 KB Created: 2021-10-07 10:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd0e0b5794be07a2b5373595f54a737a SHA-1: 3c80120e495f949c29916876c5dbb7055526b073 SHA-256: cae63514ca63c3d8e67ae78958c1e52bc2755484015c0f126a6658a2909adf0e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of it being used as a link farm. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious or deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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://edex.co/userfiles/files/75221229897.pdf In PDF document text
    • https://motoralbini.it/files/file/wufipugibebogoweped.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/kejeba.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/vorurizixujafu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5414730d07969af33b14ce48ab6ee026/zegoratubu.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabitilizesaba.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/20012634461.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/31440074356.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/31121111078.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/66354966622.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/32798002379.pdfIn PDF document text
    • http://honda-vo.com/upload/file/besosewisakeg.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/mogesetuvewu.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/73426325656.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/31589921195.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/wapekogesuzijojadibunet.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/36323870180.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/lolazovemonogulijorizigal.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091105195895.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/6108033814.pdfIn PDF document text
    • http://fohow77.ru/upload/file/56660663411.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/535655807.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/muwatefak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+most+worth+company+in+the+worldPDF 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_off0000c098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC098 10940 bytes
SHA-256: 9ac012c94bea99be6e93b79ddae1f4bdbcfc8c1284818d183843b20db0f4bffc
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 16808 bytes
SHA-256: f785336a41de935e9b2f7c7139f0d4ef19c16d2297a1ff0df41f164a5ce0a2ac

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