Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d115aaada30675…

MALICIOUS

PDF

35.6 KB Created: 2020-03-31 07:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 237e661102e24dd5a95779eb193bbf10 SHA-1: 8b09930d1f31e732ff676491eb884cf31479cf43 SHA-256: c5d115aaada30675b94b77cb032cf789d35eb8e72e5cd0903f388590ad919fa2
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, contains a URL that is also present in the list of external links. This suggests the document's primary purpose is to redirect users to a network of linked content, likely for malicious purposes such as SEO spam or distributing further malware.

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://pad-sl.org/uploads/1/3/1/1/131163864/131163864.html#5+palabras+que+empiecen+con+la+palabra+bus
    • http://primeamazon.org/uploads/1/3/1/0/131070625/2ddb932e.pdf
    • http://barbspeachyclean.net/uploads/1/3/0/3/130323449/rekepudelewutaw-puworovi.pdf
    • http://rebeccaanthony.com/uploads/1/3/0/3/130379062/dilolakanisura.pdf
    • http://hispanaonline.net/uploads/1/3/0/7/130776409/pewexanosob.pdf
    • http://kevinmckernan.com/uploads/1/3/0/3/130379051/8e22bdc1.pdf
    • http://westernrootsmasonry.com/uploads/1/3/0/8/130813851/8410877.pdf
    • http://worthyfashionboutique.com/uploads/1/3/0/7/130775476/fevoxar-xikiguzu-dujafit.pdf
    • http://fitlilsavage.com/uploads/1/3/0/6/130605283/xuteta.pdf
    • http://cdstreetworks.com/uploads/1/3/0/6/130604541/vadiju.pdf
    • http://libertylionsladiesbasketball.club/uploads/1/3/0/7/130739015/potikatal.pdf
    • http://whenlionsroared.com/uploads/1/3/0/6/130604949/ac7cf74b7e.pdf
    • http://plushstone.com/uploads/1/3/0/3/130379243/zukedetefagakod-koxemox.pdf
    • http://byblair.co/uploads/1/3/0/7/130739560/xiropupaki-bogobaxof-pepatupupor.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_off00006141.bin
ca29102b621d9c5630aa0942bb4385f611b770e6447b805d496fd12554db76ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6141 8596 bytes

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