Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c42b4e5aacdba12…

MALICIOUS

PDF

35.0 KB Created: 2020-04-15 12:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b5eb113c34cd0fc923ea31871b9d2dcd SHA-1: ed950c3c05dac0158046175473e86d34ea664e97 SHA-256: 6c42b4e5aacdba1246611590a088de4d413d101cd9b8730d92df747d4a5435ee
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various PDF files hosted on unrelated domains. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. This behavior is indicative of SEO spam or a distribution mechanism for further malicious content.

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://paddlebythepark.com/uploads/1/3/1/4/131406403/131406403.html#inverse+trig+worksheet+geometry
    • http://bizservefinancial.com/uploads/1/3/0/2/130271209/riwegisuwe.pdf
    • http://mx.davisairrepair-nwa.com/uploads/1/3/1/1/131163684/253b3f3e9.pdf
    • http://squaredisplay.net/uploads/1/3/0/6/130639926/zubizegokek.pdf
    • http://epiceatscafe.com/uploads/1/3/0/2/130274322/5100329.pdf
    • http://nouschaumont.com/uploads/1/3/1/4/131407683/mumegonikomo-tekigafu.pdf
    • http://physioac.com/uploads/1/3/0/7/130776852/f6aa7fcd640.pdf
    • http://allautoupgrades.com/uploads/1/3/0/6/130605108/b2402906f08.pdf
    • http://rodneykingwalker.com/uploads/1/3/0/5/130542991/furorululeg_batejud_jegefonitij_mumes.pdf
    • http://partidoindependientenuevaherguijuela.org/uploads/1/3/0/4/130476158/11c373ac1ab1a4.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_off00005e01.bin
bb584a18c4b1f25c162099629b9757eb62134e37a5a9631985aa39297ba8c228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E01 8368 bytes

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