Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caf6916a21b5dd8…

MALICIOUS

PDF

29.7 KB Created: 2020-04-27 18:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7c9d9ce264d892202ea6a9d52bfd4803 SHA-1: 64ce7d24491fb1109738046806e6f2288d3bdce3 SHA-256: 7caf6916a21b5dd8dc7f59f12193e2b2622064b1dc2f3607836e00fa7e6be6c9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://salondenavidadalmeria.com/uploads/1/3/0/6/130620709/130620709.html#checkpoint+endpoint+vpn++windows+10
    • http://xsaia.org/uploads/1/3/1/6/131606066/3f987082ac4f7f.pdf
    • http://thestorefrontgallery.com/uploads/1/3/0/6/130639765/pidepovusi.pdf
    • http://queenbemonyei.com/uploads/1/3/0/8/130874617/redexofokepu.pdf
    • http://starlightsteam.com/uploads/1/3/0/7/130738647/wasetem.pdf
    • http://crimsonlacademy.com/uploads/1/3/0/6/130639100/8503866.pdf
    • http://navreasset.com/uploads/1/3/1/4/131453247/4273533.pdf
    • http://jcbinvestments.nl/uploads/1/3/0/2/130288642/regexixivut_wogizamadube.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_off00004eb2.bin
84ab2b1a4824101d5eddc2b227a064675bdcf0f537d55e430e35d221d4f16741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EB2 7236 bytes

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