Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9309171e03688b4…

MALICIOUS

PDF

93.9 KB Created: 2021-04-24 01:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0eb3cfdbd19f784db87ed92f8605e9b SHA-1: 7b53f3957b83b1c7d9b1d1dd1fb7548794045d69 SHA-256: a9309171e03688b4d9174c0340b843f4d70b2e0fd7ebf65deb10c2ef4f24fd29
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed to distribute other PDF files. One prominent URL, https://kuzutuzo.ru/strik, is presented with a search query suggesting a lure for educational content. While no scripts were directly extracted, the PDF structure and extensive external linking indicate a malicious intent to redirect users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

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://kuzutuzo.ru/strik?utm_term=triangle+congruence+proofs+worksheet+answers+pdf
    • http://coins24h.com/796529914516wiuu.pdf
    • http://profapp.pro/has_voyager_2_left_our_solar_systembsq7g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://renawexit.epizy.com/getiduwejimolisoza.pdf
    • https://s3.amazonaws.com/gadumagabusodel/pixolisulabanibubugo.pdf
    • https://s3.amazonaws.com/dalava/what_can_affect_thyroid_levels.pdf
    • https://s3.amazonaws.com/jinabom/nopigipila.pdf
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_eb9c7159472741ffa9cf767cd5a32c26.pdf?index=true
    • https://s3.amazonaws.com/takateg/78886524140.pdf
    • https://uploads.strikinglycdn.com/files/648219ab-5d19-4b30-839c-26ac51a0f4ff/zanubumutokex.pdf
    • https://uploads.strikinglycdn.com/files/9e4b996f-0a9c-4b8f-a448-d82d594e76fb/aeron_chair_alternative_uk.pdf
    • https://s3.amazonaws.com/dewutexorob/51700553121.pdf
    • http://jawigunomuj.epizy.com/nevazezek.pdf
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_7c81f2c194b1424e9de23bea8f2467e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1571b437-33c1-41d1-be7b-feb7face46bd/samsung_grand_prime_plus_battery_timing.pdf
    • https://s3.amazonaws.com/mamibis/80179529789.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001098a.bin
5e93abc6f4a4991a715c7459114ee0ccd034ffc2693157dfe6d4eb8775eb6d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 5404 bytes
font_01_sfnt_off00011bf0.bin
6753230e1f24483be9a973d12066fa00dbe0727cbf892b7c5ef68abea1f7c5e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 12716 bytes
font_02_sfnt_off00014635.bin
899202e67265a92550c807c093f018ba5abb8d8b6cf763800e5c70a4e4349acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14635 16268 bytes
font_03_sfnt_off00015bc3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC3 4324 bytes

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