Malicious PDF — malware analysis report

Static analysis result for SHA-256 106175c6fb1621bf…

MALICIOUS

PDF

41.1 KB Created: 2020-04-11 22:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 81508f4f9598b41c04a8a454bb47d4e4 SHA-1: 6769758dbd09f5ab478724af3406be386fa925dd SHA-256: 106175c6fb1621bf5ec1a96bd2584b7f1736607893aaf3e93ec59e251af727a1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution mechanism. The embedded document body text, though heavily obfuscated, contains URLs that are also present in the list of extracted URLs. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to redirect users or host malicious content.

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://livingwatersfood4life.com/uploads/1/3/1/3/131379868/131379868.html#cosine+rule+rearranged+to+find+angle
    • http://adorablekidsdaycare.com/uploads/1/3/1/0/131070424/mexope.pdf
    • http://ketamine-dc.com/uploads/1/3/0/5/130547450/6f74261de9dc4.pdf
    • http://amanoir32.com/uploads/1/3/0/5/130551429/kesakot_papibataf_taxobu_fezexekewer.pdf
    • http://aethenterprises.com/uploads/1/3/1/4/131437116/lopokoda-tazaxinozanivef-komudomoganeno.pdf
    • http://softgoodsrestoration.com/uploads/1/3/0/7/130739595/dadesopijina.pdf
    • http://veteranspeakeasy.org/uploads/1/3/0/7/130740490/5244009.pdf
    • http://historiccateringeaston.com/uploads/1/3/0/5/130540193/jepij.pdf
    • http://ampzsolutions.com/uploads/1/3/1/6/131636692/571568785a36cf0.pdf
    • http://valecars.net/uploads/1/3/0/8/130813866/7128789.pdf
    • http://rusticlegacy.com/uploads/1/3/1/4/131453136/5869343.pdf
    • http://msyearbook2014.com/uploads/1/3/0/5/130545884/guxasexovemowinijo.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065c7.bin
911bde25470740e98e7522a063a62c31eb58ce7278ab045c0a35933a41b2c0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C7 9336 bytes
font_01_sfnt_off00008953.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8953 4144 bytes

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