Malicious PDF — malware analysis report

Static analysis result for SHA-256 22da1315718237d1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 19:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61341c42d2bfe659cb13ebd653cb4be4 SHA-1: 26fe1f79307047e0b5b9feac4c590b937dd40a4c SHA-256: 22da1315718237d18e29ca408dda827e630cf6ca998ec5efc3e4a4969d8099f2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to external PDF files hosted on a variety of domains, with a high concentration of links on disposable or low-reputation hosts. This behavior is consistent with a link farm designed to manipulate search engine results or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://oodow.cn/upload/file/21091322434128663300cta2g9xyrc.pdf In PDF document text
    • http://levotst.com/uploads/files/93687303446.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/64073764977.pdfIn PDF document text
    • http://vaithun.net/upload/files/58885257393.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/favudugeboxe.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/wapetob.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/57857057943.pdfIn PDF document text
    • http://myesen.life/userfiles/file/mowavo.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021911919536726.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/52877316702.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/levilofigeguribepi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/midob.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/37056253510.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/71019134756.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da505185d---9501115467.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/pameja.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/63086279235.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/99141199304.pdfIn PDF document text
    • http://alcantara.cz/data/file/gurojuwu.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/xuwozawezub.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/varamu.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210913_085532.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/98132752879.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/ruvizip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=white+hat+hacking+pdfPDF 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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 10548 bytes
SHA-256: 599ff688f22e02d67454fa0eb09c50c373288025e96a767da40d670b72945c3b
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 18068 bytes
SHA-256: 47986e5865d3c5cf4a333f9bd85e704241caa8be9a7d7da3f14a68a18464b8e4
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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