Malicious PDF — malware analysis report

Static analysis result for SHA-256 48831c4bc5fe3f2f…

MALICIOUS

PDF

80.4 KB Created: 2021-03-22 01:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f4f74b82e948d784bc39fab3a67de7d3 SHA-1: 196cf55661cdb716a5037f643b0bf9d707bde6cb SHA-256: 48831c4bc5fe3f2fee269bf6bc1019c2ff414b50c3446feb0f590bdafbe35c3d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine results or redirect users to malicious sites. ClamAV and ML classifiers also identified this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the links point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=geology+glossary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497370/normal_6034a113a776c.pdfIn PDF document text
    • http://agent-ritual495.online/frozen_cartoon_songs_download_mp3s8c2c.pdfIn PDF document text
    • https://velupilarase.weebly.com/uploads/1/3/5/3/135341581/jagusebu.pdfIn PDF document text
    • http://detonic-official.website/ringtones_for_android_download_mp3kbifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_6031357121b25.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/37f779f4fad72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388156/normal_5fdf63e4dc962.pdfIn PDF document text
    • https://wakejowedab.weebly.com/uploads/1/3/4/5/134599651/weseb.pdfIn PDF document text
    • http://se-mrush.com/87329615602y5qna.pdfIn PDF document text
    • http://reduslim-shop.site/mtx_thunder_1501d4mezl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6029d03885574.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waduzirader/masuwopununujesubufi.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/kadabra_mc_toda_gente_sabe.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/sosowimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ede97f-773b-4c23-be4d-a61b0886b5b5/37678499188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1fcdaa-8de5-4ba2-8cf3-c4771715dac0/nireworokelezuwavi.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/a_que_edad_se_caso_eva_luna_montaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a06fc9-f22d-429f-abef-74c6dae21db0/spanish_preterite_vs_imperfect_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83557dfd-3655-4501-a699-e539f1fd1c65/merujufij.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/adjective_of_quality_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad819532-ce1d-43fb-b10a-068d5479aed3/68820695688.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/visual_studio_platform_toolset_v141_not_installed.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/scotts_speedy_green_3000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/47172529158.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 5340 bytes
SHA-256: 431493812e95f95de912682c6301df734eec7e5c5eb012664d4468c69cd87724
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 11776 bytes
SHA-256: 142269ac67e4e8ebe82806e37d30da54e2343218fe33911eea2a78cbb58876ce
font_02_sfnt_off00011f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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