Malicious PDF — malware analysis report

Static analysis result for SHA-256 7543c24842ce1d6b…

MALICIOUS

PDF

44.1 KB Created: 2020-04-21 02:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ade92619c61ac3af73d39cc44188aa43 SHA-1: 8c5b388b72cc469ed4aa920e5d955deaedec8703 SHA-256: 7543c24842ce1d6ba84a00b62e8f8398427555f65a07236a4647dd511fc766bb
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 to similarly structured URLs, indicating a link farm designed to distribute malicious content or conduct phishing. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's part of a campaign 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://woohoohouston.com/uploads/1/3/0/2/130272591/130272591.html#functions+of+the+brain+pdf
    • http://teachvideos.org/uploads/1/3/0/7/130739492/vifezanori.pdf
    • http://floridaisstillhome.com/uploads/1/3/1/4/131409024/febejexomimok-xevudibo-remijak.pdf
    • http://vosfurniture.com/uploads/1/3/1/3/131379875/xuwadulole.pdf
    • http://terrysdm.org/uploads/1/3/0/2/130273987/693689.pdf
    • http://collegehumble.com/uploads/1/3/1/3/131379205/bubixol.pdf
    • http://colinyconstruction.ca/uploads/1/3/1/3/131380596/zakut-nupaxoso.pdf
    • http://luxurywhitesmiles.com/uploads/1/3/0/5/130550888/rifirofu.pdf
    • http://blingqueenwithdebra.com/uploads/1/3/0/6/130604881/kezazada_wonumamim_kilupefi_gujanif.pdf
    • http://davidquy.com/uploads/1/3/0/4/130476119/gojasumife-teberiwoxuvosuk-suzaviferu-jijukuxa.pdf
    • http://energie-sylvieanneparis.fr/uploads/1/3/0/6/130621212/bemuzuvibegadoxolij.pdf
    • http://animalwelfareaotearoa.com/uploads/1/3/0/7/130739398/a6d5022.pdf
    • http://datalytechs.com/uploads/1/3/0/4/130435763/bokerijawipefoxezaf.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_off0000851f.bin
25957569028096f35465e009de103b6a90711d026141eab2a7e7c25b6acb1811		 pdf-font-stream PDF embedded font (sfnt) at offset 0x851F 8080 bytes

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