Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64a6de0df83b323…

MALICIOUS

PDF

41.8 KB Created: 2020-03-08 06:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0fdcb42df114962ae21978ab71fa8aee SHA-1: 06386efceeea80ea0ee15bd0011889ad9c904c2d SHA-256: b64a6de0df83b32358e0f79179a7ce9a9f06c0123913ad72c7de155a5604419d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass of external links. The primary attack pattern involves directing users to these external resources, which could host further malicious content or be part of an SEO poisoning scheme.

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://mdstec.net/uploads/1/3/0/8/130813755/130813755.html#where+are+the+lanthanides+and+actinides+found+on+the+periodic+table+apex
    • http://lunabuilders.net/uploads/1/3/0/2/130288364/sixonoxafafeweduwera.pdf
    • http://canimpactinvest.com/uploads/1/3/0/7/130776619/60960d6be420.pdf
    • http://papergaming.com/uploads/1/3/0/6/130621815/8485751.pdf
    • http://www.ecuriebarnton.com/uploads/1/3/0/8/130873771/364143.pdf
    • http://connectivityusa.net/uploads/1/3/0/3/130313013/442fe609f.pdf
    • http://planetalaboral.net/uploads/1/3/0/2/130288462/topupajiriwidot.pdf
    • http://kneadedsolacemassage.com/uploads/1/3/0/9/130969690/effb5dd3b5a.pdf
    • http://skeletonsoutofthecloset.com/uploads/1/3/0/3/130379231/1607746.pdf
    • http://postmaster.inekehamoen.nl/uploads/1/3/0/7/130739061/datefixuwimuse.pdf
    • http://287ranchsupplyboutique.com/uploads/1/3/0/7/130775478/pegobelul-sifosi-wamupoxukex-tibuxerag.pdf
    • http://cantortradegroup.com/uploads/1/3/0/6/130639446/71008.pdf
    • http://kokopelliskorner.net/uploads/1/3/0/2/130271081/5889540.pdf
    • http://nageelacampus.org/uploads/1/3/0/8/130813447/3805463.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006729.bin
2dff426eca805efbcfa18059103cb0b6bb3111210add1f75298ead2546b79661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6729 7480 bytes
font_01_sfnt_off000084a4.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A4 16036 bytes

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