Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ffa033f6cc6973…

MALICIOUS

PDF

81.4 KB Created: 2021-03-20 03:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0012512faea71a2897b46f5c7f63628e SHA-1: 34220a25a0def238aef16bed571a26895f6ae43f SHA-256: e8ffa033f6cc6973062f4abbd72b8f2c4856bd27465f538bd83dc0e3f3ebcce2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://jottigo.ru/123?utm_term=broncho+vaxom+7mg+bula+pdf. The document's structure and the presence of many links suggest an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

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://jottigo.ru/123?utm_term=broncho+vaxom+7mg+bula+pdf PDF link annotation
    • https://biresunidulili.weebly.com/uploads/1/3/1/8/131856549/4754214.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/xixipuv.pdfIn PDF document text
    • https://nofojivebot.weebly.com/uploads/1/3/2/7/132740499/16bc1b0a23e34c.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/c9be1b24.pdfIn PDF document text
    • https://dozolujikofirig.weebly.com/uploads/1/3/1/8/131856703/c62f836963.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8dd64d5-51d5-49d3-a39f-b922e376f07c/gelesatotivavidorerukuneg.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_7479844e36034db1931035f9b06d97bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6328f0f6-d083-440d-b014-db0df75f05f5/waxoxopozudezexavek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c8ff76-988f-4fc3-b282-429d2b48fb60/jozuda.pdfIn PDF document text
    • https://f17d7c47-ad5c-48a5-8dbe-4a5f5c0db24a.filesusr.com/ugd/9b2d9b_8299a9a81ce7469eb08dbfbb39ea24f8.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_fb6894261fb4465695560714fca68c9d.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_58d6852d55474cc7838a2dddb2f41316.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc30d0b2-02f4-453f-85bf-c0d2b6c6fb1f/44345998214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3026e379-237f-47be-a0a2-aeefd1cd47b8/nowif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9496f2b6-5309-4563-8439-5cb3b45d1e45/sharp_el-1197p_calculator_ribbon.pdfIn PDF document text
    • http://fugodijuw.rf.gd/49322344914.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_0a7756317b2d4ff78eb143864d05921e.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_0c6639af0cf74f1abaaee3c97a26efce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f455e3-b72b-426b-8468-8e3f8e86093e/rilozalewunajonupikupepan.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_11c6d3a9db1140a2bf32666ac80a32e6.pdf?index=trueIn PDF document text
    • http://merawaboz.epizy.com/2402497497.pdfIn PDF document text
    • http://refowokewip.rf.gd/42936261247.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 5788 bytes
SHA-256: 2e9dc9194b9b15186cc099e95eb1798378dca61d5c502b44f4b895aafaa53f76
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 12928 bytes
SHA-256: 2a958e99154a3602f89b85fe181c45a3d5f1bfa05f268da5ad0d3ac249891932