Malicious PDF — malware analysis report

Static analysis result for SHA-256 2713770e2ca03cb8…

MALICIOUS

PDF

75.5 KB Created: 2021-04-02 02:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb2f660e2770e0e33e7254e1780b1a7c SHA-1: 9115e3214d8cb8bb9a3b605bf363f79a4fa2384c SHA-256: 2713770e2ca03cb8d635b5ae2bb1e94e39d8e26f1847daba8812fce9f2716aee
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/strik?utm_term=webster%2527s+french+grammar+and+exercises+pdf PDF link annotation
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/rajamabu-nikomutemuji-juzifigawirokam.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/hjijitS/2718431539.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/enMhhhc/space_swift_retro_space_shooters.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/ke6hfIC/wilefo.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/rivilad.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/kelamupilajikax.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/BjhYhcr/wapurolobulozan.pdfIn PDF document text
    • http://dirugalaw.22web.org/php_html_data_json.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd5075e9-4951-46bd-8d13-413fdd501c9b.filesusr.com/ugd/eceaf1_7d945cbfea034992be3ad1ee3df3328d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/airtable_page_designer_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/24426449333.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_55c9dfbc7659497f8aef8a124182e610.pdf?index=trueIn PDF document text
    • http://zatugawaxevi.rf.gd/tekebugonuguf.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_d703e26670fa4a92bfc51cb20c05fe3a.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_d4aad08e548a41999beb583249da0edc.pdf?index=trueIn PDF document text
    • http://vutuzepen.epizy.com/union_budget_2020_adda247.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/java_arraylist_get_index_performance.pdfIn PDF document text
    • http://fulisawuxulinis.rf.gd/27222165608.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_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 5792 bytes
SHA-256: 81f9e86d4edf52d8835cbdcf2fa6138455e3fb00f8f2a0f03fc08a9d3dc815b7
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 11268 bytes
SHA-256: c957cbc76f3d93bd74bafb5311eadab50bd9d4609240d683a7a99e930a31114c

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