Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf955f5385919e8…

MALICIOUS

PDF

37.5 KB Created: 2020-03-29 22:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 077674b30ed0c46f6f8d85dcd92d0df4 SHA-1: fc5c1ff063feca491cb79a37083ef9b9873807e0 SHA-256: 5bf955f5385919e862e0c3be1059ceea5aa3224a473f2714ef772e80ca0a5069
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various domains. The document body, though partially corrupted, contains text related to depreciation and references the wkhtmltopdf application, suggesting it was generated programmatically. The presence of numerous external links indicates a likely attempt to manipulate search engine rankings or redirect users to potentially malicious content hosted on these domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://roguestarmedia.com/uploads/1/3/1/4/131407695/131407695.html#ejemplo+de+depreciacion+por+unidades+de+produccion
    • http://vasecleaner.com/uploads/1/3/0/5/130551429/samexirolajeja-bodasuxivuku-vibowux-vowerex.pdf
    • http://bluemarbleroc.com/uploads/1/3/0/6/130639107/mirotezinopud-fozuwifibu-musojedusi.pdf
    • http://pallavimani.com/uploads/1/3/0/6/130604523/felevobirazoxif.pdf
    • http://passionatepursuit.net/uploads/1/3/0/5/130588942/muxon.pdf
    • http://moonstonemelodyllc.com/uploads/1/3/0/7/130739211/2321655.pdf
    • http://simonsformalaugusta.com/uploads/1/3/0/2/130291766/jojivovezuvegit.pdf
    • http://rhonakamar.com/uploads/1/3/0/7/130738803/bolazo-wifanofuluk.pdf
    • http://onthetrailarizona.com/uploads/1/3/0/7/130775675/morusizekufaseb_rapusaril_vujerivimex_nakelor.pdf
    • http://brighterimagemalta.com/uploads/1/3/0/8/130815381/nobude-fijuta-fiseravegotov.pdf
    • http://elna-naehen-promo.com/uploads/1/3/1/1/131163540/8058040.pdf
    • http://blakheart.com/uploads/1/3/0/5/130546538/mudimenebego_rejon.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b8.bin
748a92e8bf06e2e253f3a32584057301ba3b7bf3dfd1618a3607e2e11fc7676a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B8 9208 bytes

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