Malicious PDF — malware analysis report

Static analysis result for SHA-256 805d44f182cfade7…

MALICIOUS

PDF

36.8 KB Created: 2020-03-22 11:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 8e33adfeb6b0aa78f3a35aa57f52a5e2 SHA-1: fe9f3418f6e2b304ababea494ad0596c25cba317 SHA-256: 805d44f182cfade727d9bb9bdde1c80561f8275ced839e3c1f3ceef389ba2cf4
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 are numerically or generically named PDFs hosted on various domains, indicating a link farm or SEO poisoning attempt. The document body, though partially corrupted, contains a URL that mirrors one of the extracted links, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful sites.

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://brakeactive.com/uploads/1/3/0/7/130775268/130775268.html#como+iniciar+una+hipotesis+de+investigacion PDF link annotation
    • http://buildingproject.theworshipcenterct.org/uploads/1/3/0/2/130287976/fenilapa.pdfIn PDF document text
    • http://theartofshade.de/uploads/1/3/1/1/131164052/lobowu.pdfIn PDF document text
    • http://sonsofsocalunionforward.com/uploads/1/3/0/7/130739635/pomuboxuko.pdfIn PDF document text
    • http://heala.life/uploads/1/3/0/6/130603825/f2571277e688d.pdfIn PDF document text
    • http://jesscoxart.com/uploads/1/3/0/6/130605173/xefovezagagem.pdfIn PDF document text
    • http://cwrwwtp.com/uploads/1/3/0/6/130604078/fujesulusuzix.pdfIn PDF document text
    • http://tiffanieharrison.com/uploads/1/3/0/6/130603682/e072329e7a6c.pdfIn PDF document text
    • http://adventklinic.com/uploads/1/3/0/4/130477448/6b626c20ba15a.pdfIn PDF document text
    • http://www.theoilvibeevents.com/uploads/1/3/0/5/130540507/4737413.pdfIn PDF document text
    • http://michaelmangano.com/uploads/1/3/0/8/130813834/8ec0f57.pdfIn PDF document text
    • http://casenoibucuresti.com/uploads/1/3/0/9/130969438/a5455f.pdfIn PDF document text
    • http://highshoppingnetwork.com/uploads/1/3/0/7/130738948/1139646.pdfIn PDF document text
    • http://www.soulexcitements.com/uploads/1/3/0/6/130621486/gamez.pdfIn PDF document text
    • http://momentsbyval.com/uploads/1/3/0/4/130477829/xulefob.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 7988 bytes
SHA-256: 08c7fa91c26e62817c0a39d0e321c999c83c6ed07292c6bef416d17c4ab588d2