Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26bfbf23de98433…

MALICIOUS

PDF

41.3 KB Created: 2020-06-10 13:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e31f218895b264d2ab1609b1b8d0b5bf SHA-1: 40dc0213afe736298baa645c6168129d6025150f SHA-256: e26bfbf23de98433e0f7f248368b98c4faf3a9bd5ae4e8a8ae4d33d233884a75
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, many of which point to SEO-optimized PDF documents hosted on various domains. This technique is often used to drive traffic to malicious websites or to host further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://time2gotravelwithsuzan.voyagerwebsites.com/uploads/1/3/0/6/130604230/130604230.html#sanjar+ger%25C3%25A7ekler+mp3+indir+dur
    • http://gernone.com/uploads/1/3/0/6/130639915/88832bded1ad.pdf
    • http://mail.gladstonehistoricalsociety.org/uploads/1/3/0/6/130605374/6d7e78f3e.pdf
    • http://motorclub365.us/uploads/1/3/1/4/131437604/5001505.pdf
    • http://austin1991.com/uploads/1/3/0/6/130620990/1283229.pdf
    • http://dsgnotaryservices.com/uploads/1/3/1/0/131071188/501b37cbecbc.pdf
    • http://portsmouthboilerrepair.com/uploads/1/3/0/7/130739206/gobaravut.pdf
    • https://jafujanile.files.wordpress.com/2020/06/92047189086.pdf
    • https://wimaped597797669.files.wordpress.com/2020/06/xerofubud.pdf
    • https://togojinema.files.wordpress.com/2020/06/70752198402.pdf
    • https://perogulojifa.files.wordpress.com/2020/06/pedukaposene.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005952.bin
eb306098b017403b3ad3f69d10f22465f2b54db401e6abaa0ef83885e68b27b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5952 13932 bytes
font_01_sfnt_off000082e4.bin
29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 16132 bytes

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