Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7beed50bd9b5ce…

MALICIOUS

PDF

78.9 KB Created: 2021-03-21 02:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2873b68c751265add5ef91b80bd4ca58 SHA-1: 25cf49c6dc612598ed3431449e58334c165fba9d SHA-256: 1c7beed50bd9b5ced80d0b1d511258e684cd19937a0d435c48f7b9d032ead457
156 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 phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=anaerobias+facultativas+pdf
    • https://gatelixepa.weebly.com/uploads/1/3/1/1/131163507/6823260.pdf
    • http://koxivesuvif.mypressonline.com/individual_development_plan_examples_for_leadership.pdf
    • http://figejewumoposes.getenjoyment.net/lakepolunozutodarir.pdf
    • https://cdn.sqhk.co/xataruzepape/ekaEEwG/tornadoes_definition_plural.pdf
    • https://cdn.sqhk.co/ganinidunop/cVgghsc/wapking_south_movies_2018.pdf
    • https://cdn.sqhk.co/rurufimibiwe/IijWQji/ford_racing_download_free_full_version.pdf
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/mivasufuxora.pdf
    • http://devubowoku.mypressonline.com/whats_the_best_country_to_retire_in.pdf
    • https://fifimijo.weebly.com/uploads/1/3/4/7/134748793/174079.pdf
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/9673911.pdf
    • https://cdn.sqhk.co/vosiwuli/nvnghXB/37185249206.pdf
    • https://nivodeweje.weebly.com/uploads/1/3/4/4/134446465/xedezov-luvitesufixos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/831e2895-660d-427d-be71-088bc36e35ff/nofafuluwalejamanefuxim.pdf
    • https://uploads.strikinglycdn.com/files/46aa4e1b-506b-47ff-af36-b63c5626ece2/58050162302.pdf
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_e21999e20cbd440eaa96fce0a618eab7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fbf89ace-2ad2-4953-9966-05cc7083c5be/5_love_languages_book_author.pdf
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_683e28c438d248e0b6d8c7049f80c816.pdf?index=true
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_97b4b5015d234c9e8f96ec43cad64393.pdf?index=true
    • https://uploads.strikinglycdn.com/files/def0b2bf-947d-4ad3-bdce-291f2a7761ce/how_to_insert_sd_card_in_samsung_a7.pdf
    • https://uploads.strikinglycdn.com/files/1ae9aea2-9eed-4237-92ea-52b3cce3306d/bijunopabowajimugujul.pdf
    • https://uploads.strikinglycdn.com/files/84de1b10-c8b0-4713-8936-c3bd61e1e99c/wupegorirulajataz.pdf
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_378a2011c0464207ae3c5ef9fd5f3ad6.pdf?index=true
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_f57d8a20afd7425eb5fc591fc7ac5db7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c884e71e-bc92-40e2-8451-69358e95d9a3/ramipi.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_off0000f57e.bin
33841a7d7618eac2940e9b93b46e92df2fb477aecb081fe605e7d8502ee46aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 5340 bytes
font_01_sfnt_off000107ba.bin
81cffb12ddb9ee7e1cf8992c69822768b030452c94be8e9a7e5d19ffcbff257f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 11292 bytes

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