Malicious PDF — malware analysis report

Static analysis result for SHA-256 c889e48a66a3c385…

MALICIOUS

PDF

91.4 KB Created: 2021-03-30 03:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 404d5b94fb9017e53858d28d38161ee9 SHA-1: 9911eb7f1c2a6e7e65dbb88d4f55b157fb4af945 SHA-256: c889e48a66a3c3854efdfc2b5dff6527e01cc86e663e09db96026c8c688e8330
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or distributing malicious content. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior, indicating a large number of links pointing to other PDFs. The embedded URL points to a site that appears to be part of this link farm, likely serving as a gateway to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/wix?keyword=properties+of+kites+and+trapezoids+6-6+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4465269/normal_6032be38ad4f5.pdf
    • https://cdn-cms.f-static.net/uploads/4379048/normal_603e449b543ce.pdf
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/ec06ce88.pdf
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/nixexini.pdf
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/b525e.pdf
    • https://cdn-cms.f-static.net/uploads/4450160/normal_6052f3d519905.pdf
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/06c06.pdf
    • https://cdn-cms.f-static.net/uploads/4370294/normal_600f0371ad44d.pdf
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd388d20157a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/882c58bb-33fa-4ada-b6ce-a30f372f6625/nabibe.pdf
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_776c439ccf7541d49e4695b18ea8d651.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15e6252c-42d7-4054-9fb5-5bc4c24eca00/one_punch_man_anime_characters.pdf
    • https://uploads.strikinglycdn.com/files/558277c5-e077-4451-bb48-42182bd80d18/13026995876.pdf
    • https://uploads.strikinglycdn.com/files/1fdfac48-9b86-4265-a370-1c3b418e052f/11606256780.pdf
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_6d382cca4f844cacae0f913918f73070.pdf?index=true
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_3aa26c58279242a48221e96d86f05f4a.pdf?index=true
    • https://s3.amazonaws.com/simujix/pugilobulus.pdf
    • https://uploads.strikinglycdn.com/files/440f2cb0-594b-4238-bbb9-cae1fe95ae4c/sukulijadepuvarezeri.pdf
    • https://s3.amazonaws.com/gomakobez/3245262039.pdf
    • https://s3.amazonaws.com/dutimajizowa/minn_kota_i_pilot_terrova_80.pdf
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_c86aa8e1fef943dc926f3f5838ae88e7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/324116ec-5424-4e8e-8540-8600a0f53b23/first_grade_math_workbooks.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
    • 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_off00011042.bin
188bf1e08ef09a6d36205ca90b9362bd2508841e6414dc157a08851a438b683a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 5492 bytes
font_01_sfnt_off00012312.bin
0ad53ec5bee839615fe053f9b25b375e64ae7faa2af7bd5eb1292b21c32d281b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 11456 bytes
font_02_sfnt_off00014a59.bin
24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A59 16072 bytes

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