Malicious PDF — malware analysis report

Static analysis result for SHA-256 d389f447b769b9ea…

MALICIOUS

PDF

51.5 KB Created: 2020-04-24 21:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e0d6e0b8cd1c92a1f6059817099783d SHA-1: a7738766304e8bf857e08a0ffeb2f4eda1a898d4 SHA-256: d389f447b769b9eacc18c9a8f56ae31ab15ec2b97efca7ee28e979c87bff8ffd
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, characteristic of a link farm. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating the document's primary purpose is to redirect users to a collection of other websites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://ameenahsan.in/uploads/1/3/1/6/131606073/131606073.html#imperialismo+colonial+pdf
    • http://citizenimmigrant.com/uploads/1/3/0/8/130814288/bbda56cc345c.pdf
    • http://anaiddesigns.com/uploads/1/3/0/2/130272930/zamer_zobozoluwupofi.pdf
    • http://blossomandwren.com/uploads/1/3/0/8/130873996/b1fdd11d72d.pdf
    • http://bellavitaphotography.net/uploads/1/3/0/2/130271090/gimerugo-xejam.pdf
    • http://wacjrbulldogs.com/uploads/1/3/1/4/131454394/sijurusexisi.pdf
    • http://paintwithcode.com/uploads/1/3/1/3/131380811/rojobixokuza_lesabami.pdf
    • http://weldingtradeschools.com/uploads/1/3/0/9/130969954/279010.pdf
    • http://vytalmovementdance.com/uploads/1/3/1/4/131453358/bozejusaxumopu.pdf
    • http://onemorepointofview.com/uploads/1/3/0/8/130874332/0ae84ad0.pdf
    • http://vytalmovementdance.com/uploads/1/3/1/4/131453358
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000806f.bin
641a62352c66c2230d2303d052422638214ec9690fcd827d7497d849780351e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806F 9252 bytes
font_01_sfnt_off0000a1b5.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B5 2652 bytes
font_02_sfnt_off0000ab1c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1C 16036 bytes

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