Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd64bcf49307b46f…

MALICIOUS

PDF

38.0 KB Created: 2020-06-07 04:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c317cde3b3a35f6b10a9ab34ca71861 SHA-1: b101e6bc2c450b80a14e45fd0676409dd0b95b3e SHA-256: cd64bcf49307b46fd1a088d92607fdf83342b902d1c1228d82d5d791339172ae
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though heavily obfuscated, contains some of these URLs, suggesting the document's primary purpose is to redirect users to these external resources, likely for SEO poisoning or to host further malicious content.

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://mynaturalhairspa.com/uploads/1/3/0/7/130738528/130738528.html#latex+aligner+%25C3%25A0+droite
    • http://ibeautyconsultants.com/uploads/1/3/0/5/130539553/zesefodezafi.pdf
    • http://advantagebuildingmaintenance.net/uploads/1/3/0/6/130604617/c1b7357b1f5698.pdf
    • http://bullardspinellc.com/uploads/1/3/0/5/130551805/vokejuxipije.pdf
    • http://wolfgangcarter.com/uploads/1/3/1/3/131383647/mifulizeved.pdf
    • http://matthew-zimmer.com/uploads/1/3/0/6/130620668/babujemiwovowovap.pdf
    • http://hashtagholistics.com/uploads/1/3/0/7/130775950/zanupewu_dazewadogo_virofigolifawo_xexav.pdf
    • http://beautyinyouhairsupply.com/uploads/1/3/1/6/131637247/tezasesumajagut.pdf
    • http://gallery.luchamelphoto.com/uploads/1/3/0/6/130604693/gopage.pdf
    • http://utnf.org/uploads/1/3/0/7/130740143/pipasalo-sirije-pomom.pdf
    • https://fujovigu.files.wordpress.com/2020/06/maluziredos.pdf
    • https://defamufomowa.files.wordpress.com/2020/06/6149656989.pdf
    • https://dopidubut.files.wordpress.com/2020/06/zurawodurisozusuxud.pdf
    • https://fetexizizuso.files.wordpress.com/2020/06/saloxi.pdf
    • https://bilonuzikare.files.wordpress.com/2020/06/61815938268.pdf
    • https://vuxadowemej.files.wordpress.com/2020/06/dufatunulara.pdf
    • https://gavomibew482746657.files.wordpress.com/2020/06/71203108947.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_off000061e2.bin
43a0d336d9eb707aa6bd9ae07425fd8812f2d9f0089bde55105a6958dd360877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E2 12644 bytes

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