Malicious PDF — malware analysis report

Static analysis result for SHA-256 771846d2af4aaad0…

MALICIOUS

PDF

42.6 KB Created: 2020-05-19 06:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad0a4fd79b5f65819c5a6d5a7b9a201 SHA-1: f9d28c1ff7a9a07cb6bc62a0ad55b8de1bb726ed SHA-256: 771846d2af4aaad0d50b04a13b763bee32e0ad631e1d62cab86f15b2665eac87
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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs likely serve as a link farm or lead to further malicious content, potentially related to SEO spam or phishing lures.

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://misbailes.com/uploads/1/3/1/6/131606279/131606279.html#xanathar%2527s+guide+to+everything+pdf
    • http://nemarrealty.com/uploads/1/3/0/7/130775118/ninuko-fifir-miwed.pdf
    • http://markfeiler.com/uploads/1/3/1/3/131383949/vapanafu-kirobil-lipuwepa-lujad.pdf
    • http://dpvinyl.com/uploads/1/3/0/8/130815303/7665036.pdf
    • http://tradergamer.com/uploads/1/3/0/5/130540585/naxenijovumig_remuwokemab.pdf
    • http://bitchinbettie.com/uploads/1/3/0/9/130969265/b80cc5b37710d6.pdf
    • http://thechelseapub.com/uploads/1/3/0/7/130739993/tupoxawexuv.pdf
    • http://handsignierte-buecher.net/uploads/1/3/1/0/131069893/dfccc7ba28b1.pdf
    • http://sierrathunderfarm.com/uploads/1/3/0/3/130379635/63830cb9384.pdf
    • http://auditionhell.com/uploads/1/3/0/6/130639448/5dbfec12810be.pdf
    • http://juliademko.com/uploads/1/3/0/8/130814241/3953639.pdf
    • http://jpstateside.com/uploads/1/3/0/3/130323175/9124437.pdf
    • http://acupointgem.com/uploads/1/3/1/3/131384791/nazizakipab.pdf
    • http://903olive.com/uploads/1/3/0/4/130483167/4651223.pdf
    • http://presidentialroofingwy.com/uploads/1/3/0/2/130292007/346792.pdf
    • http://creativerecycling.org/uploads/1/3/0/4/130476065/4f344c.pdf
    • http://katiekins.com/uploads/1/3/0/4/130489448/9e2e3.pdf
    • http://adhdnewzealand.com/uploads/1/3/0/5/130588710/vajuxidonezina_wulefodixige_tamopolanosozog_wepulugejofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078f1.bin
e30f1b1138e2af170b597e93e88e0920d947647fbb13af1ab6ce0d8f3ec8de20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F1 11040 bytes

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