Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1211dbb846d4742…

MALICIOUS

PDF

55.4 KB Created: 2020-04-08 07:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ac7bf997c4f4f8993bc06fed2e582cb SHA-1: 3834a928341efc796af656a0cbbc070ee0355079 SHA-256: e1211dbb846d4742bde9f8a76c169ec0bddf3388710ea313083f7a93ff8984aa
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains references to URLs that are part of this link farm, suggesting a coordinated effort to distribute malicious content or phishing lures through these linked PDFs.

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://armorgrind.org/uploads/1/3/0/7/130740177/130740177.html#diario+de+los+debates+del+congreso+constituyente+de+1917+tomo+iii
    • http://jirsaenterprise.com/uploads/1/3/0/5/130550817/pisibapegabiba.pdf
    • http://pibackoffice.com/uploads/1/3/0/6/130639304/8650587165.pdf
    • http://marlboroughtrailrides.com/uploads/1/3/0/5/130550895/vamagogogija-sitironunovures-jofavanekugute-mepovusudar.pdf
    • http://copelandco.org/uploads/1/3/0/6/130605462/nukav.pdf
    • http://voteyesforourkids.org/uploads/1/3/0/3/130323479/vafut.pdf
    • http://carmentomassetti.com/uploads/1/3/0/7/130739379/wepolisalasij-votozagif-saxoz-zupusote.pdf
    • http://paris-lyon-japon.com/uploads/1/3/0/7/130739616/xaxuleve_xonoripexuje_lumekejem.pdf
    • http://searchmaxsolutions.com/uploads/1/3/0/6/130605083/4808063.pdf
    • http://health-and-fitness-online.com/uploads/1/3/0/5/130551219/bipilitegiw.pdf
    • http://corona-towingservice.com/uploads/1/3/0/5/130541004/gomowiwo-sowazodimamul-jiwukapu-lanex.pdf
    • http://bhavahome.com/uploads/1/3/0/3/130323291/304faa9.pdf
    • http://ptbones.com/uploads/1/3/0/5/130551449/207898333dfe.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_off0000ac5d.bin
3d5cb29d642558d3205dae6e33eeff3abc32e303aca5c4f426ef7b8a6f59ecd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5D 9208 bytes

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