Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c1276618cc1a48…

MALICIOUS

PDF

30.6 KB Created: 2020-03-29 06:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 01d3cb79c3af7f3a0aac84f14254d207 SHA-1: f5caf37c884793e2919ebd4bea9528176d35d883 SHA-256: 14c1276618cc1a48ab37dda43e2b38984cd27d42d8b90c534378be5757d67dfa
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to URLs that are also present in the heuristics and URL list. This suggests the primary purpose is to redirect users to a network of linked sites, potentially for SEO spam or to host further malicious content. No scripts were extracted, but the structure and link farm indicate a malicious intent.

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://ankezimmermann.ca/uploads/1/3/1/4/131408008/131408008.html#let+me+guitar+chords+zayn+malik
    • http://highpointvillas.com/uploads/1/3/0/5/130552084/7541f39.pdf
    • http://www.adelemenichella.com/uploads/1/3/0/6/130604025/461042.pdf
    • http://mollylizzio.com/uploads/1/3/0/8/130874046/1582784.pdf
    • http://recyclingartsdepartment.com/uploads/1/3/0/2/130288642/9701478.pdf
    • http://mackenzieemievents.com/uploads/1/3/0/7/130775398/binikoke.pdf
    • http://www.fdhunt.com/uploads/1/3/1/4/131437827/figinulu-giwizovixu.pdf
    • http://ctocllc.com/uploads/1/3/0/6/130603978/zorojap.pdf
    • http://pursuitofcraftiness.net/uploads/1/3/0/7/130776418/2efe4.pdf
    • http://oatbardicschool.org/uploads/1/3/0/5/130588388/kerixe.pdf
    • http://mycompanyapp.com.au/uploads/1/3/0/5/130551427/45f9fb9b1e8124.pdf
    • http://overlandremovalsairliebeach.com/uploads/1/3/0/6/130604467/d714acd0.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_off00005138.bin
91122573d5dd7b6a06f795365da6b7a223b2c168043929541d7c073fb4f5cfd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5138 6648 bytes

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