Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d73a1c882e59a11…

MALICIOUS

PDF

35.7 KB Created: 2020-04-19 07:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a848cd6ecf9f40b3c382b00e3d6322bf SHA-1: ff913a869d470086791d98e5ef8017b69a05b2a0 SHA-256: 6d73a1c882e59a1131608d6c3a6a2c7bca9d10ab56de5a1c2a4ef806688e6607
104 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a likely attempt to distribute malware or phish for information. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to facilitate the download of a second-stage payload.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sauerlandhypotheek.nl/uploads/1/3/1/4/131454237/131454237.html#amar+ujala+uttarakhand+pdf
    • http://sacopeevalleyheatingcooling.com/uploads/1/3/1/4/131410434/setekirus.pdf
    • http://gvpc.com/uploads/1/3/0/6/130620811/53441ea0.pdf
    • http://emyrpenlan.com/uploads/1/3/0/4/130476607/46f5dfdbbd42ed.pdf
    • http://emptynesteruniversity.com/uploads/1/3/1/1/131164223/gefoxa.pdf
    • http://willowcreekducks.com/uploads/1/3/1/6/131637830/pomudusu_somavow_wofebitur.pdf
    • http://cossmogaming.com/uploads/1/3/0/5/130590724/9008134.pdf
    • http://hookupfoto.com/uploads/1/3/0/7/130775292/daduwaz.pdf
    • http://deepbginvest.com/uploads/1/3/0/5/130590296/9153dc.pdf
    • http://springroofers.net/uploads/1/3/1/4/131406109/077988f860b2e3.pdf
    • http://steadfastanimalsolutions.com/uploads/1/3/0/7/130776141/3140731.pdf
    • http://lmeclectique.com/uploads/1/3/0/5/130550944/2797717.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_off00006392.bin
9e04837abc5cffd8cf841fc48be0f050aa5d0cc38c6a93103e019688ad589a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6392 8184 bytes

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