Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bf9b4d44a30275…

MALICIOUS

PDF

35.5 KB Created: 2020-06-20 02:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a842880420a800849877e98e43a3b6e SHA-1: 692ef02d74abd41b1e23620bfc59a6b9e87bd27a SHA-256: d2bf9b4d44a302754b92c3d4c4279b887615c68fdb47cdd6efef648983215932
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which point to similarly structured URLs on various domains. The document body suggests a lure related to a service manual, likely to entice users to click on these links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to distribute traffic across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://webdisk.anotherwayllc.com/uploads/1/3/1/4/131483034/131483034.html#ampeg+svt+7+pro+service+manual
    • http://sweetsavorysouthern.com/uploads/1/3/0/2/130291507/621386.pdf
    • http://dboyzgear.com/uploads/1/3/0/9/130969424/56f679590f.pdf
    • http://familiesinthe4th.com/uploads/1/3/1/1/131164118/8309500.pdf
    • http://furnishelf.com/uploads/1/3/1/3/131380836/moroxopalez.pdf
    • http://a1492407xstreamtravel.xsideas.com/uploads/1/3/1/1/131164506/4321187.pdf
    • http://futurainfosys.com/uploads/1/3/0/4/130489265/sereraxug.pdf
    • http://annasnaturalmakeup.com/uploads/1/3/0/5/130588403/dovatepaz_nevunuduja.pdf
    • http://academyonhigh.com/uploads/1/3/0/4/130483178/boweku.pdf
    • http://ecuriebarnton.com/uploads/1/3/0/7/130739260/7088533.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003afd.bin
b456b1e183b5f0573946b56c953d6af6638cceb802297470e2a06146c5763957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3AFD 5264 bytes
font_01_sfnt_off00004cd7.bin
b3ca4d0c6a97ccf953c7f506e0db3f5c3c18d3913f7c70efff7d899e2ab750f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD7 9360 bytes
font_02_sfnt_off00006d0d.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0D 16092 bytes

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