Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a4abdbd65b0883…

MALICIOUS

PDF

132.5 KB Created: 2020-06-04 02:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d108797c4d97252052c8544c97149001 SHA-1: 1503470b72f2b09e0f9f98520c0b3e1ab7528ac5 SHA-256: 08a4abdbd65b08834d17c164ebb3dd5921a9c9e1c08ea9942f6b815a8bf0fd0a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly supports the malicious verdict, and the presence of numerous external URIs further reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mail.tnequinehospital.com/uploads/1/3/0/5/130550655/130550655.html#lalitha+sahasranamam+meaning+in+tamil
    • http://speelkoning.org/uploads/1/3/1/4/131454683/1186090.pdf
    • http://jingleexpert.com/uploads/1/3/1/3/131380916/rovidut-mifoxi-jukomakutez-zotafirilar.pdf
    • http://speedycleaningservices.net/uploads/1/3/1/3/131379174/nulusezil-maxodovigale-bexitu.pdf
    • http://sonofdragon.com/uploads/1/3/0/6/130620305/1102387.pdf
    • http://btbmovement.com/uploads/1/3/0/3/130379078/1096a9187.pdf
    • http://padgetts-pet-house.mynewonline.store/uploads/1/3/0/6/130603997/daa15d247c8d8a.pdf
    • http://crookdlense.com/uploads/1/3/0/9/130969004/fafub.pdf
    • http://maximummuscle.org/uploads/1/3/1/1/131164552/65949167.pdf
    • http://jmgardens.net/uploads/1/3/1/0/131070334/9113261.pdf
    • http://lunchboxmenus.com/uploads/1/3/2/3/132302720/1485c9cfd28.pdf
    • http://astoriapressbooks.com/uploads/1/3/1/8/131857920/darizuj.pdf
    • http://meigaomeiyulechengxianjinbaijiale.br3h.com/uploads/1/3/0/4/130435524/damiw.pdf
    • http://ascendcustomcontracting.com/uploads/1/3/1/1/131163635/vixid_kolekasen_zedudefe.pdf
    • http://mail.tnequinehospital.com/uploads/1/3/0/5/130550655/terms.html
    • http://mail.tnequinehospital.com/uploads/1/3/0/5/130550655/dmca.html
    • http://mail.tnequinehospital.com/uploads/1/3/0/5/130550655/policy.html
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nuxejilujuja.files.wordpress.com/2020/06/daxuke.pdf
    • https://sojobumowoz.files.wordpress.com/2020/06/luruvev.pdf
    • https://tudekasimur.files.wordpress.com/2020/06/wixuxi.pdf
    • https://dowamikuju.files.wordpress.com/2020/06/pinezidukewawoma.pdf
    • 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://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000199ab.bin
9b8651e027cc4aacf3c0093fae3dc98badb248277f044cf508d17cdfbcb986f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x199AB 33216 bytes
font_01_sfnt_off0001d63a.bin
49a7b6a6022ad0750f3ce9b713f85c7cd2f2c955e32e46ddff28ce33b45939fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D63A 3740 bytes
font_02_sfnt_off0001e1b4.bin
a8af17f1ac57bde32fe2d6eb13b93d33a854e8f318be8d7992a323c3d2d63352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1B4 10500 bytes

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