Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef989605eadbd45…

MALICIOUS

PDF

89.8 KB Created: 2021-04-23 15:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c7810bc6d7a15cfdcb651735eda13e SHA-1: ceb86275be03a0ca6a3f9a55e7d05148aaeaa10f SHA-256: 2ef989605eadbd45faca99221b55eda7967518533d16f9b0863bc2be015ec63d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion identified as a link farm, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=woman+warrior+chapter+5+sparknotes
    • http://helplnstagram-confirm.com/jusidaxaxufererjp01b.pdf
    • http://kamefutebiwef.mywebcommunity.org/regrouper_plusieurs_pages_en_un_seul_document.pdf
    • http://fimewot.xyz/best_self_tanner_2020_walmartppxes.pdf
    • http://suvekitubexeso.getenjoyment.net/vidopelixamat.pdf
    • http://gugibugud.mygamesonline.org/attention_lyrics_file_download.pdf
    • http://bibuzikufaje.mygamesonline.org/14063904774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_8abc4e7a192d45c3b34a4269fbedebc8.pdf?index=true
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_8860259243d946fcb94b5565730d0fab.pdf?index=true
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_2a5d674bb0454fdd8c49d87be09bafa5.pdf?index=true
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_7e24c9652a994f5e99395cd87d2323bb.pdf?index=true
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_1948bff64c104196b90b3738d4660886.pdf?index=true
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_4fd0d5cc97b04c898b07f718470cde53.pdf?index=true
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_b569e7685934433cb36beedf6748467f.pdf?index=true
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_a05d7b8312024e2f906dd9c3d0a7c04d.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_d2fb87839fab42eb9244ddbe087e4bab.pdf?index=true
    • http://suruliloxapesas.myartsonline.com/evaluation_orthographe_cm1.pdf
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_8768d2d69df342c5bf7e32514d3eafb8.pdf?index=true
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_43323c17e32d4ed6862ffd9dc5c81f64.pdf?index=true
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_477e9f57dc224ef29579c0ca422ca475.pdf?index=true
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_1b97342bddc141768a1636e9a1c87f5e.pdf?index=true
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_5bfbad2d197949f6a2d97883d579398e.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d10.bin
c885c5d60e8b56f23cceee93b8f04c8abe1adb6a804e7894df33e11ccc6521b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 5436 bytes
font_01_sfnt_off00011f78.bin
ca0f296e8fc28b8bc8d26c44eb52683fc63e195281f94fc84692c3afa7af7442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 10732 bytes
font_02_sfnt_off00014439.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14439 16204 bytes

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