Malicious PDF — malware analysis report

Static analysis result for SHA-256 75da5972a91f902f…

MALICIOUS

PDF

83.7 KB Created: 2021-03-22 08:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 501b6e245da03f5da53a2a4164ff3bdc SHA-1: ea77016b9da8570412f05f753fd3cd8b6340adfd SHA-256: 75da5972a91f902f91fee4955b78ba11f3e65a728e94f37f69d1e4f270ea4727
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially harmful websites. The primary malicious URL identified is https://maypoin.ru/award?keyword=website+development+proposal+letter+pdf, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/award?keyword=website+development+proposal+letter+pdf
    • https://cdn.sqhk.co/zezaxemepe/ehdjaMs/wrinkle_spray_near_me.pdf
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5ff8c0542239c.pdf
    • https://cdn-cms.f-static.net/uploads/4412413/normal_601843826fa9a.pdf
    • http://fewudutizoxom.medianewsonline.com/10530182717.pdf
    • https://cdn-cms.f-static.net/uploads/4394061/normal_6055ff35d35e4.pdf
    • https://cdn-cms.f-static.net/uploads/4460450/normal_6054c65ceb000.pdf
    • https://maraduwiz.weebly.com/uploads/1/3/4/3/134363873/8400657.pdf
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6055a3377a955.pdf
    • https://cdn.sqhk.co/tavikebepo/jjAheNL/ziwulazuvexurosesisilus.pdf
    • https://cdn-cms.f-static.net/uploads/4462974/normal_604440be710eb.pdf
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fcdae3084840.pdf
    • https://cdn.sqhk.co/piwizogir/dzjh9xE/mobizen_screen_recorder_for_samsung_pro_apk.pdf
    • http://rotiwopofeze.mywebcommunity.org/24687166649.pdf
    • https://cdn-cms.f-static.net/uploads/4464874/normal_6027dd866d59d.pdf
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/5131547.pdf
    • https://cdn.sqhk.co/tefazaturar/dhiyBih/42123613322.pdf
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/1562398.pdf
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5fe8ec7cb519f.pdf
    • https://cdn-cms.f-static.net/uploads/4414701/normal_6050720f63e6d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pusapovewazigu.onlinewebshop.net/how_to_fit_an_integrated_headset.pdf
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_ec75e42498d3402c95aeec73ca7f12c1.pdf?index=true
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_3b8cd04fff7a44c7b49aa0ffe98d58c3.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_4a58bb178bf141d8bfef6adec06b093e.pdf?index=true
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_512b613832924e539776bb0a5895e2b6.pdf?index=true
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_8839bb9720c84b808cf32026f6ec685b.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_off000109cc.bin
9b90ac2b89a82847aa0467a0f42b142d76578d99f39e9a3cee4fadd93fc930ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 5400 bytes
font_01_sfnt_off00011c13.bin
0771d87800ded087976673f01cc19cae9ba9dc785352a655995f3de6517c7307		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10756 bytes

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