Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef23c9ab65a47dd8…

MALICIOUS

PDF

72.6 KB Created: 2021-04-01 12:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1467407a875cb64473ed149ee9f6055f SHA-1: b94e041f3d8b9abfb1b90b63961b1dbae35d6b58 SHA-256: ef23c9ab65a47dd89e663a471527fda6e0c7e410d73a15d5d70063690bf67826
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=sport+head+tennis+2+player+unblocked
    • http://sojurufo.iblogger.org/46522108730.pdf
    • https://cdn.sqhk.co/xumupojamax/jghhge5/57863446366.pdf
    • https://cdn-cms.f-static.net/uploads/4366044/normal_60533be8bd9cf.pdf
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6048e00cb2f16.pdf
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/ebf2dacac6d.pdf
    • https://movakesomerinid.weebly.com/uploads/1/3/4/5/134528648/8105257.pdf
    • https://cdn.sqhk.co/dosijowikul/ghqihat/jowidukuxakarosalekonezi.pdf
    • https://cdn.sqhk.co/fasotaluvose/Nsjj4ij/pocket_door_pull.pdf
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/3169012.pdf
    • https://xibixijuli.weebly.com/uploads/1/3/5/3/135399677/2759171630e8.pdf
    • https://kukaweferoba.weebly.com/uploads/1/3/4/7/134754127/4d6670952b89f03.pdf
    • https://juviroxekeko.weebly.com/uploads/1/3/5/3/135399696/9455764.pdf
    • http://tejajugumoneton.66ghz.com/sezotileda.pdf
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5ff34bb1ee59e.pdf
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60147ced94cfa.pdf
    • https://cdn.sqhk.co/pigalixow/cajftjc/42253018591.pdf
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/7a35ff8a36a.pdf
    • https://cdn.sqhk.co/luzorisu/jjdifhg/tags_to_get_likes_on_instagram_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xotewewo.rf.gd/lenticular_flip_lens_sheet.pdf
    • http://ketanuviz.epizy.com/movie_apk_for_firestick_september_2018.pdf
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_40d7e05e0f7c4b30b90866d6f017b7c2.pdf?index=true
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_81e8d4d9fe9c4014970c0279a56d685d.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_9cfb93ff2a0244a88d74fee32d04be98.pdf?index=true
    • 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_off0000de12.bin
e4a4e84ab487b77f5c585b5f91dc236e8c59de398c517ba5df34dafddb1f370a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 5704 bytes
font_01_sfnt_off0000f171.bin
90469ca26db7b06e6f937c899ddd42921d3b6ebfe54377c1a13c7f89758fa664		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 10320 bytes

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