Malicious PDF — malware analysis report

Static analysis result for SHA-256 d541d0811d9fde22…

MALICIOUS

PDF

41.6 KB Created: 2020-03-23 12:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb591940f92c9c75da39221952e87a72 SHA-1: baa61657a1ddf036427ec71781043ef73bd27dc1 SHA-256: d541d0811d9fde22056181e35d3758a991b2899486967227da841ebfcb4f7c22
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, includes a URL that points to a page titled 'Problemas de multiplicar para 4 primaria', suggesting a lure. The primary function appears to be directing users to a network of linked PDF documents hosted on various domains, likely for SEO spam or to distribute further malicious content.

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://leahjoyandsaintpatrick.com/uploads/1/3/0/5/130589033/130589033.html#problemas+de+multiplicar+para+4+primaria
    • http://guided-discovery.com/uploads/1/3/0/4/130476896/39306d49d53.pdf
    • http://rvtrailertires.net/uploads/1/3/0/8/130873976/zevebumemitogop.pdf
    • http://skilledjoestore.com/uploads/1/3/0/4/130483198/kopovazaxig.pdf
    • http://swimmingwithoutborders.org/uploads/1/3/0/6/130620795/6b3543748a016a9.pdf
    • http://www.ditsycomic.com/uploads/1/3/0/7/130776886/tewuxo-zujobusonefo-wozovademite-takinigubuvuwi.pdf
    • http://brockmillerbasketball.com/uploads/1/3/0/8/130814121/45dce97e4c80.pdf
    • http://fibrolife.info/uploads/1/3/0/5/130539679/8240104.pdf
    • http://www.t-shared.de/uploads/1/3/1/0/131069843/radesadasix.pdf
    • http://www.robbiehamblin.com/uploads/1/3/0/7/130775959/rilubaxudejagejug.pdf
    • http://fortmyersfusion.com/uploads/1/3/0/6/130639100/6921754.pdf
    • http://relaysecurity.com/uploads/1/3/0/5/130538990/4406957.pdf
    • http://xmasbash.party/uploads/1/3/0/5/130550729/borumumad.pdf
    • http://mobile-care.info/uploads/1/3/0/6/130620919/1515013.pdf
    • http://nfldraftdays.com/uploads/1/3/0/7/130739699/9835430.pdf
    • http://anjulantrealestateandinsurance.com/uploads/1/3/0/4/130476083/nuvapar.pdf
    • http://mail.donzhenphoto.com/uploads/1/3/0/4/130476294/xajorife.pdf
    • http://www.meadvindental.com/uploads/1/3/0/4/130489446/gilebevetovulox.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_off00007a36.bin
f672d83e6e15619a961b2401c2260ca8a8818c020a3e353fa629cdfd012eb96f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A36 8424 bytes

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