Malicious PDF — malware analysis report

Static analysis result for SHA-256 393cbfa844b17422…

MALICIOUS

PDF

39.4 KB Created: 2020-03-21 15:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c608977b0d4ab46164535b4c7277369b SHA-1: 79fc5c020f02a072512ea311f5e5838c3644de54 SHA-256: 393cbfa844b17422db8f815448d226b1d9ccfdc414b583766c60017d2e15903f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains some of these URLs, suggesting the primary purpose is to redirect users to a multitude of other PDF files hosted across different domains. This is a common technique for SEO spam or to distribute further malicious payloads.

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://bmajorevents.net/uploads/1/3/0/6/130639895/130639895.html#personas+morales+sat+que+es
    • http://nokr.nl/uploads/1/3/0/7/130739993/147074.pdf
    • http://affairsbykim.com/uploads/1/3/0/6/130622033/pepixateran-dulixe.pdf
    • http://hallesdaughterfashionandaccessories.com/uploads/1/3/0/7/130775842/zovetagowerat.pdf
    • http://district1.net/uploads/1/3/0/6/130604220/440b1e8d8.pdf
    • http://www.eaglesnestathighfall.com/uploads/1/3/0/6/130604844/tijor.pdf
    • http://clickart.co/uploads/1/3/0/2/130287976/vagubukigovu.pdf
    • http://vlascc.com/uploads/1/3/0/5/130588407/7119220.pdf
    • http://smokebrushfoundation.net/uploads/1/3/0/2/130288629/a8c6c68ff67b7.pdf
    • http://opalwolf.com/uploads/1/3/0/6/130604520/mobanom-lowofibepigag-nevuvo-duxoba.pdf
    • http://mesonelbomba.com/uploads/1/3/0/6/130620416/eef7ae29d0.pdf
    • http://artsandhovercrafts.com/uploads/1/3/0/5/130540193/jarosifuga_jogojero.pdf
    • http://acrossthetowns.com/uploads/1/3/0/5/130547527/07e42384.pdf
    • http://www.temporalities.org/uploads/1/3/0/3/130379226/b0600477ddf4817.pdf
    • http://kazbeecreatives.com/uploads/1/3/0/8/130874143/2b91cf17ce.pdf
    • http://ccrewdogs.com/uploads/1/3/0/3/130312969/kevined_mewazujoro_tadefi.pdf
    • http://rem5vrlab.com/uploads/1/3/0/7/130739763/da085b0f59c60cc.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_off0000708e.bin
d5a4d54cbd002dcfa569aa30201d2421660b86edcbaf780e4b0d8f8719cb0853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708E 8328 bytes

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