Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b9906f624b6b6d…

MALICIOUS

PDF

39.0 KB Created: 2020-03-23 14:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d576444d62d094f052722003325a915b SHA-1: f640febdd580b9a1185b9512a5babcc105349529 SHA-256: 82b9906f624b6b6d75d873c1dbba81820c66b3320044064c7b3eb5e4ce333029
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to various domains, identified as a 'PDF SEO Link Farm' heuristic. The document body, though partially corrupted, contains URLs that are also present in the list of extracted URLs. This suggests the primary purpose is to direct users to a network of linked PDF files, potentially for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted, but the extensive linking pattern is indicative of 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://paulhobkirk.com/uploads/1/3/0/4/130435531/130435531.html#planetas+del+sistema+solar+imagenes+reales
    • http://mymathtutoring.com/uploads/1/3/0/5/130551639/1123113.pdf
    • http://parkourcamp.net/uploads/1/3/0/5/130538994/lujozamezame-vipajezafu.pdf
    • http://universitynest.com/uploads/1/3/0/5/130551505/lubudifide_wofisemujagekil_botisurekebiz_zididemekulewa.pdf
    • http://lavishnailslounge.net/uploads/1/3/0/7/130775361/5377284.pdf
    • http://chrisdrake.horse/uploads/1/3/0/4/130435795/3217393.pdf
    • http://www.militaryhistorylive.com/uploads/1/3/0/2/130272548/kogarud.pdf
    • http://barricas.nl/uploads/1/3/0/7/130740202/1146536.pdf
    • http://carlossalazarlomelin.com/uploads/1/3/1/1/131164164/mofojudirefuwapi.pdf
    • http://spellakit.com/uploads/1/3/0/2/130289333/7975748.pdf
    • http://shepardlogisticssolutions.com/uploads/1/3/0/5/130590700/jivegujupotojop.pdf
    • http://pgthelabel.com/uploads/1/3/0/8/130814192/laduv.pdf
    • http://japservicesllc.com/uploads/1/3/0/7/130738962/7683340.pdf
    • http://amodernplace.com/uploads/1/3/0/6/130620230/3635867.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_off00006d5d.bin
07fca2dac050870e9d8a1b8adfc53b23a3a6e9c61a7fd5e2b344ac03ce3e3d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5D 9248 bytes

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