Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c03161fbd669e2…

MALICIOUS

PDF

57.6 KB Created: 2020-04-02 03:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 48f90cecd2be6cfb4926a4f9de9785cb SHA-1: d4ae4db60b19203f38393148bd21f1acf710ea98 SHA-256: 11c03161fbd669e2242ea5a56027811043d66ff54aca7e16d488027895e75dd1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of embedded links pointing to external websites, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links, likely intended to direct users to malicious content or phishing pages. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://krystalclearcleaning.org/uploads/1/3/0/4/130483794/130483794.html#c%C3%B3mo+se+dice+asistencia+en+ingl%C3%A9s
    • http://josephinezipporah.com/uploads/1/3/0/6/130620195/7397647.pdf
    • http://mirrorinyourattic.com/uploads/1/3/0/5/130550879/guxerinevubutulu.pdf
    • http://katherinegaulke.com/uploads/1/3/0/3/130313272/buvuli-bovobanozoduz.pdf
    • http://athenealam.com/uploads/1/3/0/2/130288341/b3b6cf56f.pdf
    • http://uibds.org/uploads/1/3/0/2/130270823/rujebu-siriwelotimagud-sesez.pdf
    • http://petersoncounselingservices.com/uploads/1/3/0/8/130874347/3863730.pdf
    • http://everythingnaughtyandnice.org/uploads/1/3/1/1/131164112/5846545.pdf
    • http://rfwhilephotos.com/uploads/1/3/0/9/130969277/cb795e.pdf
    • http://daradee.com/uploads/1/3/0/4/130490006/vavenofezixikoni.pdf
    • http://maysmemories.com/uploads/1/3/0/5/130547078/devasokeremofe.pdf
    • http://chrisloganministries.com/uploads/1/3/1/0/131071196/gopedo_magagalazurew.pdf
    • http://fcusdrama.com/uploads/1/3/1/0/131070605/116bd4b7f056e3.pdf
    • http://openradio.es/uploads/1/3/0/5/130551402/logeminodimiwopolo.pdf
    • http://alphafitathetics.com/uploads/1/3/0/3/130324005/migewolejaraxetode.pdf
    • http://triedandtrueforyou.com/uploads/1/3/0/4/130436289/8414668.pdf
    • http://kastus.xyz/uploads/1/3/0/8/130874529/wejilibeki.pdf
    • http://truthhomeinspectionservices.org/uploads/1/3/1/1/131164372/6740aa0a00d.pdf
    • http://intimaterevolution.com/uploads/1/3/0/3/130323145/3182147.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009116.bin
2b4bebb93cf7617955c8fde8bf45ca62600bdb7b434a8421c678bcbe00c30223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9116 9572 bytes
font_01_sfnt_off0000b3b9.bin
59d8a097129a595d6828513bcc5b4d47c00a7c4de9545a43efee4f2c176228e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B9 4288 bytes
font_02_sfnt_off0000c144.bin
65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC144 16096 bytes

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