Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdbcb1b9612cd9b…

MALICIOUS

PDF

34.1 KB Created: 2020-05-25 01:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: ab34c3e1219f387721d4cf458013ccbb SHA-1: 91d47af89c53976c60ec240c629774d52a2632f1 SHA-256: 3cdbcb1b9612cd9be0fcf30b3f27dc7849bb6e8ee9f44b140d87c0211344f7c7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains. This technique is often used for SEO poisoning to drive traffic to malicious sites or to distribute further malware. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://saintthomasparkcircle.com/uploads/1/3/1/4/131406453/131406453.html#pathfinder+elite+weapon+set PDF link annotation
    • http://kangameplay.com/uploads/1/3/0/6/130604949/xawuza.pdfIn PDF document text
    • http://bladescommerciallawncare.com/uploads/1/3/1/4/131454029/78d34.pdfIn PDF document text
    • http://plmwichita.com/uploads/1/3/1/3/131379980/zububemegono.pdfIn PDF document text
    • http://jcroofingspecialists.com/uploads/1/3/0/6/130622093/696418.pdfIn PDF document text
    • http://huayuangroup.net/uploads/1/3/1/8/131872138/jekogunetagugumirov.pdfIn PDF document text
    • http://evehudsonphd.com/uploads/1/3/0/9/130969840/8292005.pdfIn PDF document text
    • http://mta-sts.mx.sportsecurities.com/uploads/1/3/0/7/130776314/481dfbae3.pdfIn PDF document text
    • http://constructiondollarsandsense.net/uploads/1/3/1/4/131438825/22a8d2302.pdfIn PDF document text
    • http://twindo.ca/uploads/1/3/0/2/130287529/lugejitigokikitaxir.pdfIn PDF document text
    • http://toptieragent.com/uploads/1/3/1/6/131606672/8873525.pdfIn PDF document text
    • http://linearmeasurmentinc.com/uploads/1/3/0/3/130379317/wibibiviluru.pdfIn PDF document text
    • http://pcaspiritwear.com/uploads/1/3/0/3/130324158/kilulegap.pdfIn PDF document text
    • http://theviewegypttours.com/uploads/1/3/0/5/130590163/pawemaz_vozabito_xizen.pdfIn PDF document text
    • http://theretroists.com/uploads/1/3/1/4/131407194/1a726f07.pdfIn PDF document text
    • http://aaron.ag/uploads/1/3/0/8/130813798/pafowonugil.pdfIn PDF document text
    • http://komercallc.com/uploads/1/3/0/8/130814235/fded7.pdfIn PDF document text
    • http://afgcontracting.com/uploads/1/3/0/6/130620612/junefesa.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58D8 10528 bytes
SHA-256: f9e0cc106558e2746b47c65cec61b2ffeaefc2903d75ae3958962629db6fd71b

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