Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a1e00a1862ff67…

MALICIOUS

PDF

43.7 KB Created: 2020-11-06 22:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d2b2a1ce67740515acdd7919ac740072 SHA-1: 2247ad9d150d92c2ba5d741d31008e15536da958 SHA-256: 43a1e00a1862ff6755cadd4da6b033fbbbef308935868c5d14f49ab2008a33be
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, identified as a link farm, which are likely intended to redirect users to malicious websites. The heuristic PDF_SEO_LINK_FARM and the ML classifier strongly indicate malicious intent. The document body, though partially corrupted, contains a URL that appears to be a lure for a calendar PDF, suggesting a social engineering tactic.

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 https://traffnew.ru/aws?keyword=june+2020+blank+printable+calendar+pdf PDF link annotation
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/tosiwez.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/naxogibitefopevef.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/malowi-wofoze-sutiwus.pdfIn PDF document text
    • https://koxarakofawel.weebly.com/uploads/1/3/4/3/134310925/burekifatelujabez.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/e54ee.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/leloxabi_rinamiserofaxan.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fubisi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dogisur.files.wordpress.com/2020/11/nabozageguxa.pdfIn PDF document text
    • https://s3.amazonaws.com/waxejajinigafu/21st_century_astronomy_the_solar_system_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0b4b06-2d70-408d-b151-c39f6af6c419/zumamitomerafikusowe.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/gubal.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/subojezamuroko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e638c117-4e3f-46c7-8cb7-dac4c66826db/49954058262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4aa0be4-853a-4cdb-aaf1-7a84d1c88ff8/20999628062.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/mezopobugodapudugurodidel.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAC 5436 bytes
SHA-256: 24a0505b031af00e2f085bf72883c5fe42e16662919f5dfdf03275e3d21f9a97
font_01_sfnt_off00007e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3D 10444 bytes
SHA-256: 2189a6232f274858cadd45982e8cd5650481e9d81b6d5737ed9915105ed2a7c8

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