Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4cad91d7aa1e99…

MALICIOUS

PDF

93.7 KB Created: 2021-03-25 19:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 348db0d3bf27fa9ba9d3b39200e574a5 SHA-1: cef1ea221e51433e216b067b46edc5de03125568 SHA-256: 3d4cad91d7aa1e9949bce263210f73bcd00b243a75bd45a90f18e7bba38c843d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=are+sat+required+for+class+of+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367301/normal_60526c0e88ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_5fd33754b693b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_600d86c530419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_6048442cb29c5.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/poner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5feb4c4380ff2.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/94160439655.pdfIn PDF document text
    • http://jaxixojuko.mypressonline.com/waltz_for_debby_lead_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_602cf5026f912.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5ffb3194a9d81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_13cfb01290514faea3cd3c8a09c3f786.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_1be1fad0806149e29156507bbff920e4.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_4cd49c6385884e519d2f05b5620bb223.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_39111365f8274978a89310c5069ff6ee.pdf?index=trueIn PDF document text
    • http://xigesema.epizy.com/94945750360.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_47c61a856cb74df7aa910ff7c4cfda57.pdf?index=trueIn PDF document text
    • http://datidalumoz.rf.gd/xoteziti.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_782ed925b2ee4f70aeb872021ec54b17.pdf?index=trueIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_dcb9df1949f545fe813f039f2a558037.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_21f3d6cc6c2d4c33b365116413dac31f.pdf?index=trueIn PDF document text
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_4a9667c620924cc1be02ef74fdd605e0.pdf?index=trueIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 3136 bytes
SHA-256: df71740bcf0f50be481a3519b744d391d1383f2cad4370a7003c069d562e3104
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 5456 bytes
SHA-256: e74c943facb543422b5aed99026cdffb73a7700bbc710942a4271bc6f81da259
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 2312 bytes
SHA-256: 7f347e6b12639bc9e40ab9678d8c42a53894e2710dc204f6dad9c3e97353b8bc
font_03_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 11572 bytes
SHA-256: 9ba16175681c9f2afe78430b01cace75cb9df6bc2daa87e6241319d56c03ccb8
font_04_sfnt_off00014bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDA 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17
font_05_sfnt_off00016030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16030 1736 bytes
SHA-256: f27f1dab863be407bc80ce69f069aaa000ada345c50a5fba1d6b915b5f603bb6

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