Malicious PDF — malware analysis report

Static analysis result for SHA-256 169f73f71d3dee0b…

MALICIOUS

PDF

29.9 KB Created: 2020-04-04 13:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7b0dcb256f7cb845f62cb7763e0b82e4 SHA-1: 18879d7aee0cb8b391ad9326de13c23433f77fdb SHA-256: 169f73f71d3dee0b8aca1991add1c379e5f2485621bb32a71c02da65c341be0e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content or manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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://juliejesternewman.com/uploads/1/3/1/0/131070847/131070847.html#oh+my+ghostess+ep+16+recap
    • http://dsgchallenge.org/uploads/1/3/0/6/130603884/47cb5b7fc13599.pdf
    • http://blizejdomu.com/uploads/1/3/1/4/131437350/josisekisase.pdf
    • http://birthworkerinclusivity.com/uploads/1/3/0/4/130494389/d74f4d8bad638.pdf
    • http://healingpointnc.com/uploads/1/3/0/6/130620950/toxegofipuzewumuz.pdf
    • http://hickorylaneconsulting.com/uploads/1/3/0/3/130312984/ralubolajesob_sakewubarididas.pdf
    • http://ddrncboa.com/uploads/1/3/0/3/130313525/nelovasep.pdf
    • http://bbcvbs.com/uploads/1/3/0/9/130969298/7372820.pdf
    • http://rfjobstoday.com/uploads/1/3/0/6/130620979/7eb1286e2a977.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_off00004edd.bin
c888b840fa3f647558390e656c4534f74b32c5347146e63fdbc5b095e4726157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EDD 7132 bytes

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