Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5c9cefe03dd681…

MALICIOUS

PDF

75.4 KB Created: 2021-03-10 09:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e665b48ea336ea7a651801ed21b93d65 SHA-1: e6c548daf8a15b4c124879128a5ff5d06272fabf SHA-256: 1c5c9cefe03dd681fd355d431a875c1751ac117283e36ff43f8beffe40c9e603
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. One of the external links, https://golowaki.ru/123?utm_term=black+desert+mobile+app, is flagged as unknown reputation, while others are confirmed benign. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=black+desert+mobile+app
    • https://cdn-cms.f-static.net/uploads/4368991/normal_60457278634be.pdf
    • https://cdn-cms.f-static.net/uploads/4501962/normal_5fe803e664ac5.pdf
    • https://cdn-cms.f-static.net/uploads/4408984/normal_6011fb9106ffc.pdf
    • https://cdn-cms.f-static.net/uploads/4464529/normal_60224db09d135.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3ce5b8fd-3bff-46a0-90c3-882a552751c9/americas_book_of_secrets_special_edition_episode_1.pdf
    • https://s3.amazonaws.com/kifutizijebuj/78237545485.pdf
    • https://uploads.strikinglycdn.com/files/26ced598-c551-459a-9181-671180e35a9b/46547851751.pdf
    • https://s3.amazonaws.com/xanunafojuloki/tneeya_low_battery_video.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_da5498f7b6af439fafa4a5bdcfb301c0.pdf?index=true
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_44eb0c8bd8e3417a961cd44b749d584e.pdf?index=true
    • https://s3.amazonaws.com/vidadaviwal/34759167694.pdf
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_0e29750e86b344c0bc8e88f179cbf4e8.pdf?index=true
    • https://s3.amazonaws.com/jeworurowam/vifoj.pdf
    • https://uploads.strikinglycdn.com/files/fcd1e7fe-c662-4b91-82f8-0f03a05702f7/powinidukikuwozilewu.pdf
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_12689dd3ccf54d65b877fc5789dd6ef6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fce2ab00-3d5c-4743-955a-a80f63b1886d/mutaroxade.pdf
    • https://s3.amazonaws.com/xedewofuretujo/informed_consent_medical_template.pdf
    • https://s3.amazonaws.com/goneduzum/33380198339.pdf
    • https://uploads.strikinglycdn.com/files/1422ff21-e801-4416-882f-e0a1be852314/32023536259.pdf
    • https://uploads.strikinglycdn.com/files/f7339c76-04d1-4e67-89e9-eea807ceb0f6/list_of_structured_data_types.pdf
    • https://uploads.strikinglycdn.com/files/3e37c32b-3bd1-4723-85d5-8a2c28288bc5/difabavigepot.pdf
    • https://s3.amazonaws.com/wemazun/cheer_up_charlie_piano_sheet_music.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_d0e6067ca06e4eea9a327ed540d7e923.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d0df5497-8424-4deb-9f6a-e3aaabbcc520/socio-cultural_environment_meaning.pdf
    • https://uploads.strikinglycdn.com/files/c69e4db7-8517-4413-9e44-4d6c83c83ea5/44477746574.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_off0000e884.bin
50ea2d0e74e06b3b49949574873c743a235e0facd8996b588275cc121f82d5e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 5472 bytes
font_01_sfnt_off0000fb03.bin
c2ebdc583fe46ec47b45b20ccd05e5444e704dd7e94d5312e2a194bad3cec639		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 11212 bytes

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