Malicious PDF — malware analysis report

Static analysis result for SHA-256 1065d91252390ae1…

MALICIOUS

PDF

39.7 KB Created: 2020-05-22 16:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f9c07eb8709f2fe6166c84bed359923 SHA-1: 0aca05c1a8c0793075e6753a3b014f0dab908ff0 SHA-256: 1065d91252390ae1cd62b5b56e1d0bc5fe1408d69ccabcc62ffde52176ce6a33
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a method to distribute malicious content indirectly. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://3jx.undesirable.us/uploads/1/3/0/2/130289466/130289466.html#kwame+nkrumah+definition
    • http://relaxkidsnyc.com/uploads/1/3/0/5/130590395/revuwi-zobibofaniwofin-ridujoko-vinanekakokixaw.pdf
    • http://paulpretty.com/uploads/1/3/1/4/131405976/somewezer_dakas_vedofoleko_volorapa.pdf
    • http://lifeandlandscapesphotography.com/uploads/1/3/1/1/131163854/xatopakonujakaj_rediturisov_kemagaketibakat.pdf
    • http://cargotrailerhouston.com/uploads/1/3/1/0/131069970/buxexab.pdf
    • http://culturecandles.com/uploads/1/3/0/6/130620752/najekotetivi-mimuvirusowuno-xetef-monitonefid.pdf
    • http://thebespokebohemian.com/uploads/1/3/1/4/131406453/ecaa037b0fee.pdf
    • http://ownerofmanyhats.com/uploads/1/3/0/4/130476804/ninuxameza.pdf
    • http://sundayoboy.com/uploads/1/3/1/6/131637224/kuxomuvezavuzodazor.pdf
    • http://iamkynggran.com/uploads/1/3/0/8/130874400/kusoruvitenubaribuzu.pdf
    • http://shopdsu.com/uploads/1/3/0/8/130873997/gilagaxovot_detomikedoxavom_wiguvol_danibuxo.pdf
    • http://urbancamel.org/uploads/1/3/0/4/130435679/9056056.pdf
    • http://egccwarriorbags.org/uploads/1/3/1/6/131606073/4128473.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070b0.bin
883288b1786a8de12ffab485e0095ea173402aa2dd24dbf11bfd8a7f9023bdfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B0 10324 bytes

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