Malicious PDF — malware analysis report

Static analysis result for SHA-256 16de9db1133f175d…

MALICIOUS

PDF

39.1 KB Created: 2020-04-09 15:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b956e0c5c252d37814e9ae0c79770db9 SHA-1: f80d4f6ff2e0238509b0f7318a632a9111e4130a SHA-256: 16de9db1133f175d332c44c0573581f3435c29a818fa6c64e6ca51c036a15fb0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous suspicious URLs supports this assessment. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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://bondibaybotanicals.com/uploads/1/3/0/4/130435561/130435561.html#que+es+el+pmbok+en+espa%C3%B1ol
    • http://flspec.com/uploads/1/3/0/9/130969674/talozobofob.pdf
    • http://515hospitalityconsulting.com/uploads/1/3/0/2/130270882/kobegiref.pdf
    • http://teshuvah.international/uploads/1/3/0/7/130775859/50dd8ef.pdf
    • http://puppyfood.us/uploads/1/3/0/6/130639588/kogejezimapofig.pdf
    • http://coybutstormy.com/uploads/1/3/0/4/130476066/6543191.pdf
    • http://stockadeskincare.com/uploads/1/3/1/3/131384660/25f0da.pdf
    • http://insureapplemacbook.com/uploads/1/3/0/2/130272083/1946523.pdf
    • http://mackofsales.com/uploads/1/3/0/5/130543025/5cc1de499.pdf
    • http://emilykong.net/uploads/1/3/0/8/130873914/7452746.pdf
    • http://wisdomfromaboveministries.org/uploads/1/3/0/4/130476709/digalato-dogaxinadanesir-kizekuluxovuxi-zanakenudawage.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_off00006d70.bin
ba8d0e6b1b67e70de425ba0c012a61a5e4bc9e25d257f6cdbb30a3f02c4140f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D70 9012 bytes

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