Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25ee8116a3ac18e…

MALICIOUS

PDF

73.7 KB Created: 2021-03-25 04:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d288913ab1a6f72d58a31c9fa745cf5 SHA-1: 534b7dae563f46a800f520b3a3d6de4a82409bbe SHA-256: a25ee8116a3ac18ebe5cce50932ed7e338feee735f3d1e95ac606b46e481eff3
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous external links, including one pointing to 'maypoin.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO spam tactic. While no scripts were explicitly extracted, the presence of external URIs and the ML classification strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=plastic+engagement+rings+for+bridal+shower
    • https://cdn-cms.f-static.net/uploads/4391335/normal_603187e07ece2.pdf
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5fe2ec1ccedd3.pdf
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/nixagomagon_zokaxoju_gukorinisubo.pdf
    • https://static.s123-cdn-static.com/uploads/4375351/normal_5fcf34d8c9417.pdf
    • https://cdn-cms.f-static.net/uploads/4475392/normal_60243e12ae212.pdf
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/gukapidazaluwatixa.pdf
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/pigiruw.pdf
    • https://kuxelozipapim.weebly.com/uploads/1/3/1/8/131871637/4093645.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mukutud/experiencing_the_tangible_presence_of_god.pdf
    • https://s3.amazonaws.com/fasudikek/isbn_barcode_generator.pdf
    • https://uploads.strikinglycdn.com/files/c0e735e8-2130-41ee-bbc7-7e48be7d0409/why_is_my_ego_battery_flashing_yellow.pdf
    • https://uploads.strikinglycdn.com/files/ec27fb1e-8b55-4b64-afdf-55420221baa8/41661725278.pdf
    • https://uploads.strikinglycdn.com/files/cea24cf4-abf0-4b2c-a938-1ca0c197da7f/61273832424.pdf
    • https://uploads.strikinglycdn.com/files/b255d8d1-f590-4e05-bedd-4fb922ff333e/pagelilixererajizubewofa.pdf
    • https://uploads.strikinglycdn.com/files/c5b0538a-cd42-413d-9d7a-bb4cff737beb/asus_rampage_v_extreme_m.2.pdf
    • https://uploads.strikinglycdn.com/files/577ec990-9cd5-41be-98ec-60625a6ef6fc/ximonus.pdf
    • https://uploads.strikinglycdn.com/files/5e4baeb2-d26f-4ee6-9275-4c57d10e31b4/42654145531.pdf
    • https://uploads.strikinglycdn.com/files/31ff6e49-ff16-4dbb-a175-885907766d0c/what_can_i_eat_on_purium_cleanse.pdf
    • https://uploads.strikinglycdn.com/files/1142db62-5803-416c-8f59-bd7dd324eaf8/prentice_hall_algebra_1_answer_key_chapter_2.pdf
    • https://uploads.strikinglycdn.com/files/0c4544e3-6fc2-4b88-ab54-4f677f867cd8/43591014273.pdf
    • https://uploads.strikinglycdn.com/files/c39de685-7211-4300-8198-423eff7376e5/zewibinituvilixekabuganiv.pdf
    • https://uploads.strikinglycdn.com/files/01360af3-c1fa-40a9-a895-507928565cf4/23692691474.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0df.bin
eaae2fe85f61a506ac3b7e685574b1880f874939cb9f851d55c0680f5f506d94
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 5668 bytes
font_01_sfnt_off0000f40a.bin
2a42f1def06d948f58dd0f3314c3a9404d488a9c98ac1ef9c6d35a73f2d769a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 10956 bytes