Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7fcb4e24ae747b…

MALICIOUS

PDF

58.6 KB Created: 2020-04-05 06:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed11cde92e16cce3b02e6c8778408275 SHA-1: 9d39132947e2436b88024149bf582f1485374fc8 SHA-256: 5b7fcb4e24ae747b59ae0bfa874bfa2c30f1375a335e7256c5dc40c3cc1c8527
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation 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. No scripts were extracted, but the sheer volume of links suggests a malicious intent to drive traffic or distribute further payloads.

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://jjminvestments.org/uploads/1/3/1/3/131397997/131397997.html#house+of+mirth+characters+quizlet
    • http://shesriding.com/uploads/1/3/0/3/130379293/nakugib.pdf
    • http://samuibluewaterhomes.com/uploads/1/3/0/3/130313436/5db683b2.pdf
    • http://jorjatikaramnutrition.com/uploads/1/3/1/3/131380992/tovowanirududebexeko.pdf
    • http://shopsymmetry.com/uploads/1/3/1/1/131163691/tegezizejapis_juvodubuvudeden_tijigana_lepejetulalogeg.pdf
    • http://interiordesignca.com/uploads/1/3/1/4/131407061/78a8abcdb0de.pdf
    • http://ldsuperior.com/uploads/1/3/0/6/130621055/gonarisosa-zixilarugibikup-nojoxa.pdf
    • http://suncityprides.org/uploads/1/3/0/4/130488970/wudozoroditivoxub.pdf
    • http://saifmurtaza.com/uploads/1/3/1/4/131406610/9377370.pdf
    • http://newzealandlgbtiawards.com/uploads/1/3/0/7/130739522/dizulaf_wopaf.pdf
    • http://weltradevn.com/uploads/1/3/0/5/130539345/9d987e117bfa6.pdf
    • http://obesityassistpro.com/uploads/1/3/0/6/130604911/9e8619.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_off0000bda3.bin
e4724b9c10552e9efbbf35324dd215110a7022682f6c6976dc7643083df12850		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA3 8184 bytes

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