Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ac4b0b6bcc55fa…

MALICIOUS

PDF

101.4 KB Created: 2021-04-03 12:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea9c2d318ab4072d00535167e57a6c5c SHA-1: db8fece50d5a32830377a70df1bc173f6509ca3d SHA-256: a8ac4b0b6bcc55fafc520ed06fb6edce6fe0d905dc439202599acb72b134ec6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one prominent URL pointing to 'nipisod.ru'. The document body, though heavily obfuscated, contains keywords related to the linked URL, suggesting a phishing or SEO manipulation tactic. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://nipisod.ru/wix?keyword=gang+violence+statistics+nz
    • https://vepawedisekonok.weebly.com/uploads/1/3/4/9/134900222/kazak.pdf
    • http://nipodek.22web.org/pebabadowevil.pdf
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/38b3165d631.pdf
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/tewusasidewaxud.pdf
    • http://gonugotez.22web.org/73810720853.pdf
    • https://jovofodofipepij.weebly.com/uploads/1/3/2/6/132682866/136253.pdf
    • https://fiwuvoreguno.weebly.com/uploads/1/3/4/0/134000104/jiruvijilolepuja.pdf
    • https://gunuxaruta.weebly.com/uploads/1/3/4/5/134588955/1958530.pdf
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/fivolelotoruzo.pdf
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/492dc4453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/12244982-8295-4129-b640-ce536037f2ce/69339042110.pdf
    • https://uploads.strikinglycdn.com/files/73fc5cd2-e727-4cd4-aa43-7e9a7f28592c/new_sales_simplified_power_statement.pdf
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_39b3e71cb92a4d04b853b9f47b4d29ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a14405b8-8a6f-47ae-a370-22bee76123c0/nlp_books_for_beginners_free_download.pdf
    • https://uploads.strikinglycdn.com/files/19633f66-0d29-48b5-90d2-e4e7031e2ae9/dell_optiplex_3010_ram_upgrade.pdf
    • https://uploads.strikinglycdn.com/files/6aa6f49f-3705-4183-b0d2-2871edff5dea/nivaf.pdf
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_e3e710c3e39d4d1aafbf803ce1c753d8.pdf?index=true
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_2d2af83014104522b923b5fccd10985c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f73a8e62-e245-48bc-a7b6-1f89887eccd1/39948876868.pdf
    • https://uploads.strikinglycdn.com/files/c2bcb7f4-77a4-4e3d-a401-42f3bfadc018/73406251842.pdf
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_0e72c6da09e84fae9b21b6780e8a5b41.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87b22c4b-06fb-478a-b6e0-17104ee90966/singular_and_plural_nouns_worksheets_for_grade_3.pdf
    • https://uploads.strikinglycdn.com/files/9bb7cec9-2776-4450-aed5-617eba347d62/5549573556.pdf
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_a536fada3ca1479f808df0d6840513d9.pdf?index=true
    • http://puximonivafozij.epizy.com/how_to_fix_indiglo_light_on_timex_watch.pdf
    • https://uploads.strikinglycdn.com/files/c505d4e4-2113-4a49-9fb8-5bcba1b0a991/voselazipivimiw.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_off00014e45.bin
edaf3c45084f6ea0e87e7dd9b2c4ea902c2d26c6eb592755e266aed98e7dd325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 5012 bytes
font_01_sfnt_off00015f7e.bin
adc2324180cc003260604b5fdb4b42a177fb202802bce008012b82ed1b311e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F7E 12280 bytes

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