Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc2cc40a9e78639…

MALICIOUS

PDF

37.3 KB Created: 2020-05-19 02:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fa1e066229ab5c3b6b3f004d638349a SHA-1: 8b66d0cbb1d801427dfe27708cd6309385fb7778 SHA-256: 5dc2cc40a9e7863907ef24541f722775aeed319a55b75f48678cc4a7aca93fab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or a mechanism to distribute additional malicious content or redirect users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF.

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://sweetestdreams.org/uploads/1/3/0/5/130550792/130550792.html#elements+compounds+and+mixtures+work
    • http://greenapedesign.com/uploads/1/3/0/5/130590583/bupewaxabusuborofot.pdf
    • http://milehihbanks.com/uploads/1/3/1/6/131606354/5647639.pdf
    • http://benjaminkholbrook.com/uploads/1/3/0/5/130590051/kudarariwowefoj_momirafepotun_sedosibunapav.pdf
    • http://photosbypro.com/uploads/1/3/1/3/131380236/5403007.pdf
    • http://ssandh.org/uploads/1/3/1/3/131383648/57b5f5e6b.pdf
    • http://prop47lawyer.com/uploads/1/3/0/6/130620645/110178.pdf
    • http://sjspreunion.com/uploads/1/3/0/8/130814052/wapilisuj.pdf
    • http://fivestarorganizing.com/uploads/1/3/1/4/131437425/2493591.pdf
    • http://thisissmartoysters.com/uploads/1/3/0/6/130639349/1084354.pdf
    • http://chicagokilnrepair.com/uploads/1/3/1/4/131437025/c752fe5b0.pdf
    • http://naturamp.pl/uploads/1/3/0/5/130543198/c6318d1133.pdf
    • http://brunmartidytan.info/uploads/1/3/0/6/130620501/7343050.pdf
    • http://opticalwarehouseopticians.com/uploads/1/3/0/8/130874485/66fcdea753b.pdf
    • http://rapidrinsempw.com/uploads/1/3/0/6/130605498/ximezuruxelem.pdf
    • http://missionpeakrobotics.com/uploads/1/3/1/4/131406591/8575127.pdf
    • http://grayberts.com/uploads/1/3/0/4/130483558/guwovumivinevorapib.pdf
    • http://mdacconstructioninc.net/uploads/1/3/0/8/130813059/6dc0e12758d9c.pdf
    • http://truehairculture.org/uploads/1/3/1/4/131454500/zawumovaj.pdf
    • http://sewbusy.net/uploads/1/3/1/1/131164066/bekufum.pdf
    • http://bsp500.org/uploads/1/3/1/1/131164375/vuramunubeg_kuwawubal_doxemukijotito.pdf
    • http://topgunmd.com/uploads/1/3/0/8/130814290/mibil.pdf
    • http://dennergroup-mobile.com/uploads/1/3/1/3/131398134/disumejaf.pdf
    • http://leathernecklandscapingandcleaning.com/uploads/1/3/0/3/130313224/c3b99032.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_off000066a7.bin
d4e88dda8d2daae0995d63a5e82f4576c4cf04513182d5119bb0fffdf2b57a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A7 10084 bytes

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