Malicious PDF — malware analysis report

Static analysis result for SHA-256 2923e8b54bda8c3e…

MALICIOUS

PDF

81.3 KB Created: 2021-03-24 23:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7e2d0aaa6c7b7cb56817452ffa441291 SHA-1: 6e2c16d6452ec1e316d21eef2e7cfb98dfd49d5a SHA-256: 2923e8b54bda8c3e2301f820060948013bb99e2db2a2ce97a8eab6a6baa37f5d
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 functions as a link farm, containing numerous external URIs, with a primary suspicious URL pointing to 'soxebez.ru'. The heuristic 'PDF_SEO_LINK_FARM' suggests the PDF is designed to generate traffic or manipulate search engine results by linking to many other documents, some of which are hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=a+love+to+last+april+3rd PDF link annotation
    • http://1fps.ru/2494179342jczus.pdfIn PDF document text
    • http://dkblogin-de.com/66330520504l621h.pdfIn PDF document text
    • http://sputnews.com/dreamworks_wheres_waldo_charactersd3wux.pdfIn PDF document text
    • http://goods-amzon.com/training_man_hours_calculation_formulap6dha.pdfIn PDF document text
    • http://lesitegu.iblogger.org/bascule_rs_asynchrone.pdfIn PDF document text
    • http://mastera-saydinga.ru/bridgeport_series_2tkl6n.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/c385b522-e24c-4b5a-8df2-41c905bc3403/wokojivuvujotulumujatoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c262de82-a61b-481c-87bd-9c34033f2a89/xezisum.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_76e1c39f80fc46d5b59fc9fb89c88af7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9084904c-a4f6-48e8-8459-4624f3097344/nikon_speedlight_sb-600_compatible_with_canon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a4fae9-1f9a-46aa-ac88-b77bc845dd68/75946801633.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/81887437373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a8f6bf-1b7a-4eeb-a2cf-bbb04ce7c8fe/basic_engineering_circuit_analysis_10th_edition_solutions_chapter_3.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/how_much_is_prevailing_wage.pdfIn PDF document text
    • http://lefumus.rf.gd/87106720844.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_97e509ae459d48bb975f53fac47190c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/zelagujorinad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd084b0f-e1ec-404b-a264-1ebf249bedab/79736993049.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_5a1922a7957c4147bc82ab9752d64f26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/joxamuvenameroxowekuw.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_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 5168 bytes
SHA-256: 2b4d63c1957d3228fd1d986277fa00f006b218139bb4cb52d33cd6689050ebe3
font_01_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 10924 bytes
SHA-256: 7d48df1054a0b5329b82d65060103403113742127ce21b8e167ba29dcc95e34e

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