Malicious PDF — malware analysis report

Static analysis result for SHA-256 634d108609e73fc1…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 08:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c5f788e7bc0cb67c00b089755343219e SHA-1: 56d5622d9d31d65a3ec0f51834fb1e22e29e8227 SHA-256: 634d108609e73fc12cc91b91317928b2846c58407c3898e5527e174f835168fc
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. These links likely serve as a mechanism to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=math+61+ucla+midterm PDF link annotation
    • http://vijexibat.mywebcommunity.org/kifazexovevilax.pdfIn PDF document text
    • https://xebuwonivaxatev.weebly.com/uploads/1/3/2/6/132696015/xajazeparepogesam.pdfIn PDF document text
    • http://damvglaz6.xyz/list_of_words_with_silent_letters_in_english8rk2m.pdfIn PDF document text
    • http://ru-payment.casa/platicas_prebautismales_merida_2020vkiic.pdfIn PDF document text
    • http://storedubai.shop/639260910s2i6s.pdfIn PDF document text
    • http://cleanup-sale.site/american_chopper_meme_formatcvce4.pdfIn PDF document text
    • http://freedate18.xyz/partnership_deed_in_gujarati_language98k7u.pdfIn PDF document text
    • http://polikarmonolit.ru/corporate_social_responsibility_stakeholders_influence_on_mnes_activities28sxs.pdfIn PDF document text
    • https://lebotuzipum.weebly.com/uploads/1/3/4/5/134519329/fbf740e272c46c.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/defet.pdfIn PDF document text
    • http://liolika-rsya.ru/4932994180g5sfb.pdfIn PDF document text
    • http://hallop.xyz/printable_list_of_feelings_and_emotionsi4ci3.pdfIn PDF document text
    • https://vidisuxusa.weebly.com/uploads/1/3/1/6/131606291/dijojezikowirov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_3b03085602324b0191931d5c15776442.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_177e4c7bec684dfb9c5d60b63d390ea4.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_f0e87ca1f0eb43b68cad19273ff7dc46.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_209fa22666094941b99c38f26b3b2834.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_2298d87db0824ff0ae6b9fc6f5ece478.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_de0f17195f554cc1a97e42c1916e8dec.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 5212 bytes
SHA-256: 7eaee9850af0f2f378473e998f35b92dff4ba42d6743674d791b0704115d25ab
font_01_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 11188 bytes
SHA-256: ce00ed04c438899adbc7c799c22fb3496612c6f8bc527e8cba5f864a7672b191

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