Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5953ae7fdbc80b…

MALICIOUS

PDF

43.6 KB Created: 2020-11-09 00:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 197583c886d69b7992bb2f8614042ceb SHA-1: c557c64124c3ed3a350c6789adc58d29cbb55c34 SHA-256: 8e5953ae7fdbc80b49ce9422f6633533b5eba3f6306612b2867d9730057f774b
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to cloud storage, suggesting a link farm or SEO poisoning attempt. One URL, 'https://traffnew.ru/123?keyword=always+running+pdf+download', is flagged as unknown reputation and is likely malicious. The presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading further content. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=always+running+pdf+download
    • https://vuzejugusu.weebly.com/uploads/1/3/4/4/134486163/mazesuwavuwijo.pdf
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/7a79285f794.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rebomedug/potenejewi.pdf
    • https://s3.amazonaws.com/zuxadol/kizasokizu.pdf
    • https://s3.amazonaws.com/jolituzoji/the_men_s_health_big_book_of_exercises.pdf
    • https://demoxugu.files.wordpress.com/2020/11/hp_deskjet_f4580_wireless_setup_windows_10.pdf
    • https://s3.amazonaws.com/jazuravazaguz/petimizanojub.pdf
    • https://s3.amazonaws.com/tizowodifi/dangling_and_misplaced_modifiers_exercises_with_answers.pdf
    • https://s3.amazonaws.com/megodipewukitoj/proceso_isocorico.pdf
    • https://s3.amazonaws.com/julaxel/39160571949.pdf
    • https://s3.amazonaws.com/lebaxa/dezofufugeferav.pdf
    • https://zekalewuwodo.files.wordpress.com/2020/11/leviworutizofos.pdf
    • https://tatedavozuxu.files.wordpress.com/2020/11/16832931248.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e06.bin
0b8eddc5fc3239d39a2ac3e54a05882020fc2bf68ffffa61d04a5b1c58fd624d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E06 5076 bytes
font_01_sfnt_off00006f59.bin
a1f03ff4607f269e1bbe44cdac4b8e449243452038c53962a31f8585e3e0d24e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F59 10648 bytes
font_02_sfnt_off0000939c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x939C 4324 bytes