Malicious PDF — malware analysis report

Static analysis result for SHA-256 e250d8e70adc1955…

MALICIOUS

PDF

51.3 KB Created: 2020-03-09 04:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d54740ee2860890967befd2607323d65 SHA-1: 60380206ac3f44b1a27c697dd8779531f71ef173 SHA-256: e250d8e70adc1955f84f3ef5a991e31c50afdc135f001d3883039a199e0c445a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links to other PDF files hosted on various domains. This technique is often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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://74-123-76-227.mgwnet.com/uploads/1/3/0/3/130312914/130312914.html#corporate+social+responsibility+meaning+pdf
    • http://vanentrepot.com/uploads/1/3/0/2/130289573/wisewu.pdf
    • http://emigrateawayusa.com/uploads/1/3/0/9/130969415/nasalopivoror_xabemaludabap_xulemuwale.pdf
    • http://vitalvore.com/uploads/1/3/0/5/130541356/4bfbb828f8.pdf
    • http://freshtatsic.com/uploads/1/3/0/8/130874021/jivesebezu.pdf
    • http://fitspit.online/uploads/1/3/0/6/130621942/jopulepig-velenofa-fakiri.pdf
    • http://typingduel.com/uploads/1/3/0/8/130813948/lewaz.pdf
    • http://tamarackcreekoutdoors.com/uploads/1/3/0/3/130313741/8536089.pdf
    • http://westranchswim.com/uploads/1/3/0/2/130288729/boduwe-suzekomorezop-pujosiwamo.pdf
    • http://ip-athletic.com/uploads/1/3/0/6/130622007/b95c5.pdf
    • http://customlovecandles.org/uploads/1/3/0/7/130738758/1a31a36ae0102.pdf
    • http://azguide.net/uploads/1/3/0/4/130477026/serepi.pdf
    • http://cielpur.com/uploads/1/3/0/4/130483200/3437003.pdf
    • http://internationalstudentmoodcenter.com/uploads/1/3/0/6/130621158/zexonikoguzumen-wekakon.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_off00009ebc.bin
9912a7298745a73445e587bae72ab1a84ae71ad01f11893636db1034b39efb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EBC 8720 bytes

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