Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93f6dcb6fd0508e…

MALICIOUS

PDF

123.3 KB Created: 2021-05-31 20:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb3a43649f656e2edb1873bfcf157373 SHA-1: 2fd78ddd1b6c9c27614fd44f07cb7871c22d2e52 SHA-256: f93f6dcb6fd0508ede2882959d309a4b09b0e7acd9c4ff754e60946fe0f351c6
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, specifically a 'PDF link farm', suggests an attempt to direct users to potentially harmful websites. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chcial.ru/pbw?utm_term=oraciones+copulativas+y+predicativas+ejercicios+online
    • https://cdn-cms.f-static.net/uploads/4411682/normal_60607a9eec2b1.pdf
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/zigemunazexi_vakimoto_dopabesoko.pdf
    • https://tidufafedufokaj.weebly.com/uploads/1/3/4/6/134693038/fuwonomok-babukunuval-vakanorabefa-midarada.pdf
    • https://jasoveloxera.weebly.com/uploads/1/3/5/9/135967924/kitojixufomusag.pdf
    • https://cdn-cms.f-static.net/uploads/4451737/normal_605bc54abbbfb.pdf
    • https://nugubigu.weebly.com/uploads/1/3/5/3/135323865/5b8eae1dcfaf5f4.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/tugowotamibavix.pdf
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/43b99d621e.pdf
    • https://static.s123-cdn-static.com/uploads/4415930/normal_5fc736d595ea7.pdf
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5fdd32a3cb489.pdf
    • https://napujokid.weebly.com/uploads/1/3/5/3/135339673/6117761.pdf
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/1035665.pdf
    • https://barezixajeg.weebly.com/uploads/1/3/4/3/134318527/suxozo_jaruvike.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/72f4c4a6-4ee4-4fc4-b40b-165d941f395f/how_to_use_microsoft_access.pdf
    • http://gediripu.pbworks.com/f/how_to_increase_tiktok_likes_and_followers_2020.pdf
    • https://uploads.strikinglycdn.com/files/146e9446-beb4-4b7f-9d0f-119aeead3fb8/how_to_wash_maxi_cosi_pria_85_max.pdf
    • https://uploads.strikinglycdn.com/files/7a935bba-e96e-4efd-84a6-18e38aba937f/webojajoboruxuni.pdf
    • https://uploads.strikinglycdn.com/files/99a9b7e0-c0c7-4ced-b2fb-477a9cf6370b/91153747957.pdf
    • https://uploads.strikinglycdn.com/files/44048a9f-83e8-47d3-8b61-02e4deb3742b/78041775465.pdf
    • http://bekivuxuga.pbworks.com/f/kotiganajatebizibora.pdf
    • https://uploads.strikinglycdn.com/files/cd1db811-0886-4262-bcee-407939392ac2/88982256014.pdf
    • https://uploads.strikinglycdn.com/files/2bd9fa94-8bac-4b34-9fef-35b7ad8ba219/cien_aos_de_soledad_audiolibro_completo_-_primera_parte.pdf
    • https://uploads.strikinglycdn.com/files/786fafc4-dc73-4f1f-974c-0212bd1dbd9f/77619864026.pdf
    • https://uploads.strikinglycdn.com/files/2495e4de-aa3e-418f-942d-3aa83b1400a4/cry_baby_gcb-95.pdf
    • http://jajisaparev.pbworks.com/f/exercises_for_sciatica_pain_youtube.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_off00019e74.bin
f6da87b11ec4a2773cae2fd418cbfc2746f32b9e32fee3ec0778870a0f9e7015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E74 5332 bytes
font_01_sfnt_off0001b0b2.bin
4edc4212bf4b015d7939d0fcab1e19976d8e8abcbd31bab79e9db99285855952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0B2 14056 bytes

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