Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d1a38d2d1f5fa3…

MALICIOUS

PDF

85.5 KB Created: 2021-03-16 06:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e0fe8db0d84813b21c3f2e8c6eafac0f SHA-1: bc06af4733f709346caa561d96107e19abb31c8a SHA-256: e0d1a38d2d1f5fa36291bacba5bb59b30cbcf73a29f93f8530391b5b5ed866eb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm, likely for SEO manipulation or to direct users to phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the nature of the links suggests a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=bartonella+bacilliformis+slideshare PDF link annotation
    • https://cdn.sqhk.co/fiwujumejuf/8eig1hc/paint_brawl_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/iaiiGja/45416283053.pdfIn PDF document text
    • https://cdn.sqhk.co/nonebizi/ejijfgd/virustotal_scan_results.pdfIn PDF document text
    • https://cdn.sqhk.co/buzosefif/ihgfxMo/kidotatasitibaw.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/mgjihEF/iphone_x_new_ringtone_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvivazonewa/eZ5r7xx/photo_collage_maker_app.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_49c4c5e3ff8e4c5d8b640f1538b9c68d.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_b05a6305efa240ffa8769827feea4dcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pipaneku/kiwufemiba.pdfIn PDF document text
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_8663ff3db2fa4f86ad82a7b039816fce.pdf?index=trueIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_1df9d0dc5d3d4db795019aba9170839b.pdf?index=trueIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_7c0c9f0625a4445395c11f33cbff7827.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_fd22d15194af40e0b4d415b04c02d3c2.pdf?index=trueIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_fdbf1e5251f245eba48e6f8ef8de468d.pdf?index=trueIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_4090b8bfbc1840cfb27709c413ec7723.pdf?index=trueIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_096a31401cce472ba2ed5ede7824652c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/kujifebonuwewagapevumugor.pdfIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_65d6fc9202f64328b08c51fac0997eaf.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_b0102e7ce7424ef0aa8076a92e546d8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomudufe/85974908833.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 1852 bytes
SHA-256: 17628c3712add54b53a102dab7a5336c21d224fb11bd04fe86a1f3a0fc232773
font_01_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 5452 bytes
SHA-256: 7f61b2f80e06fd9b387794d5032d1d129aa0f96e6f1feda2bf90e38e8d7d47ca
font_02_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 12360 bytes
SHA-256: 2e8be344b5db10c629a18cfc7db246ce8c4cd27fcd600346000845a8b22795a8

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