Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b354f4d1196ab70…

MALICIOUS

PDF

38.6 KB Created: 2020-03-29 23:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d9ddb6be0aa4847b63af799b015ae5e7 SHA-1: 994fd8beac231859852585251536a98639b6f9c0 SHA-256: 5b354f4d1196ab707928181dd89964144dff7115bd2844ab4befcf4f2338be23
104 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO manipulation tactic, embedding numerous external links to various domains. The ML classifier strongly indicated maliciousness, and the presence of a PDF_SEO_LINK_FARM heuristic firing suggests the document's primary purpose is to generate traffic or distribute content via these links. While no scripts were explicitly extracted, the embedded URLs themselves are the primary indicators of malicious activity, likely leading to further malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oakclass.com/uploads/1/3/0/7/130739758/130739758.html#3+words+8+letters+say+it+and+i%27m+yours+book+2
    • http://grazrootzskatefest.com/uploads/1/3/0/4/130476594/8980205.pdf
    • http://carlaciagrant.com/uploads/1/3/0/6/130639342/lejasik_goliburuz_rijobefowalar.pdf
    • http://mikedonovancoronado.com/uploads/1/3/0/7/130738909/c5091ff9adc.pdf
    • http://thevetvanguard.com/uploads/1/3/0/9/130969747/jemosopak.pdf
    • http://robertoluigimauri.com/uploads/1/3/0/5/130551141/gopegiwuzizego_suxitowi_misuzite_zipapivakezupu.pdf
    • http://morrisiennafarm.net/uploads/1/3/0/4/130476089/domegatobopobozemez.pdf
    • http://newesttester.com/uploads/1/3/0/6/130639231/3005726.pdf
    • http://uccarticle9.net/uploads/1/3/0/5/130589412/jumifibi_tenik_ligedavetexu_gexoxunizodaki.pdf
    • http://sateprosales.com/uploads/1/3/0/6/130640200/8d77fce016a8af.pdf
    • http://islanderwatersports-nevis.com/uploads/1/3/0/4/130435682/c09a48.pdf
    • http://51startnew.com/uploads/1/3/1/3/131378776/pumoboxemumikijo.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_off00006d97.bin
7fefa799f77f760d823b2212b4442cbd1f11748bf45338d25146a70d299a3047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D97 8156 bytes

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