Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a81bd95439ee59b…

MALICIOUS

PDF

49.1 KB Created: 2020-03-30 11:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: d354f8ef3fa0a9ffe8d74f168118ecd9 SHA-1: 6858c67b9470d0dd1cf35783fc7a34a9abc112e3 SHA-256: 0a81bd95439ee59b539f2ea8e70b647505a4a51b028661e0411c774186aa32b0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or content-luring attack vector.

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://ccmun.ca/uploads/1/3/1/1/131163666/131163666.html#the+ring+of+winter+d PDF link annotation
    • http://hostmaster.leicesterceltic.ie/uploads/1/3/0/6/130639504/famopesegerexu_fotorogasi.pdfIn PDF document text
    • http://tinalinderman.com/uploads/1/3/0/6/130621101/2563304.pdfIn PDF document text
    • http://myelectricalservices.com/uploads/1/3/0/3/130379466/53343.pdfIn PDF document text
    • http://sadiebarr.com/uploads/1/3/0/6/130620854/batego.pdfIn PDF document text
    • http://wanderingsofalix.com/uploads/1/3/0/8/130874380/zigunupixunew.pdfIn PDF document text
    • http://powerfulseed.com/uploads/1/3/0/6/130604863/1990621.pdfIn PDF document text
    • http://ibrandshomes.com/uploads/1/3/1/3/131379059/4200123.pdfIn PDF document text
    • http://ecbdistributions.net/uploads/1/3/0/5/130589044/feteduxoxudoxa.pdfIn PDF document text
    • http://louvinapartment.net/uploads/1/3/0/5/130551687/3148388.pdfIn PDF document text
    • http://mx.heproco.com/uploads/1/3/0/4/130478004/jujise_boref_palumi.pdfIn PDF document text
    • http://my-modified.com/uploads/1/3/0/5/130551433/7089336.pdfIn PDF document text
    • http://ghstructural.com/uploads/1/3/0/5/130539131/850375.pdfIn PDF document text
    • http://thecandistore.com/uploads/1/3/0/6/130621330/xudut.pdfIn PDF document text
    • http://autoimmuneguru.com/uploads/1/3/1/1/131164295/kubimike-notaw-dapiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E9 8100 bytes
SHA-256: daadc219c476efdaded0ee7eceb2524139716f2e7601f74a153b3b9328507071
font_01_sfnt_off00009725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9725 2680 bytes
SHA-256: b7f7e294e5e71ad9281770d7fc0c95b231da430153885030f568c6bb5638ed2b
font_02_sfnt_off0000a0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B9 16424 bytes
SHA-256: 2a244e8ac3d5da013011842ad20bc8dec3c6106d2c8aac99eacee9c5e922e749

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