Malicious PDF — malware analysis report

Static analysis result for SHA-256 8156a3c6a0a632c2…

MALICIOUS

PDF

46.0 KB Created: 2020-04-28 09:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1e9ffb61d281e22adf2b408e881f8de SHA-1: 51d29a0b8257d1806befd75d36dd6ee258d38ce2 SHA-256: 8156a3c6a0a632c2653c085d1ab5e23fd30f47045e637c5a1db776e9c51dda48
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or redirection strategy. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect the user to malicious content or exploit a vulnerability through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mymissblue.com/uploads/1/3/0/5/130590779/130590779.html#4th+grade+math+final+exam+pdf
    • http://demosawblades.com/uploads/1/3/1/4/131437464/salibidamatez-wixenet-nituxeduseku.pdf
    • http://ultimatecoloring.com/uploads/1/3/1/4/131483391/2fae67b.pdf
    • http://androiduserexperience.com/uploads/1/3/0/5/130590361/710dd.pdf
    • http://shakramylaw.com/uploads/1/3/0/2/130272462/634d1d927853.pdf
    • http://tailgatewithme.com/uploads/1/3/1/4/131406505/zimodesir.pdf
    • http://hospitaldedialomorant.com/uploads/1/3/1/4/131437919/dawovamiride.pdf
    • http://svreunion.com/uploads/1/3/1/3/131380128/gelugirogus_bijodivofum_ruwufo_sageni.pdf
    • http://mypacefitness.com/uploads/1/3/0/6/130604922/zojobi.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_off0000675b.bin
7a72162c3f30b43fc59eb9080ff38fd095673e7d7a9beef07631ed6dbefeeb21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675B 8036 bytes
font_01_sfnt_off00008678.bin
1671d4a6506f7deedb25c13781f115618252e1b93a4aad0bce3c1125e559b732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8678 4388 bytes
font_02_sfnt_off00009459.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9459 16204 bytes

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