Malicious PDF — malware analysis report

Static analysis result for SHA-256 4152a95a49a8ce74…

MALICIOUS

PDF

83.7 KB Created: 2021-03-20 21:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b5ca8f84af0da69b55505922a5d9f99 SHA-1: db903ca309a5bb35d40d20bd431e61beda3f733e SHA-256: 4152a95a49a8ce7416f8ec6e8594b3aa99370029e9de2af8c07b99a70e082ca4
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 0.9996

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=china+culture+information PDF link annotation
    • https://cdn.sqhk.co/fopalixogul/hijiFft/78432634779.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/rhfogjz/doom_2_switch_update.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/gjKFjgn/pelujabakil.pdfIn PDF document text
    • http://fanuvowebutil.22web.org/97786260491.pdfIn PDF document text
    • https://miwofovewunot.weebly.com/uploads/1/3/4/8/134873206/2218133.pdfIn PDF document text
    • http://karivometiw.iblogger.org/sowesuvo.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/brother_tn_630_wifi_setup.pdfIn PDF document text
    • http://rabifew.iblogger.org/medical_terminology_for_health_professions_7th_edition_free.pdfIn PDF document text
    • http://vatemuredaxusob.22web.org/18198188935.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/genegonobibijizem.pdfIn PDF document text
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/fotujunidezop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sovizaz.epizy.com/organic_harvest_anti_acne_sheet_mask.pdfIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_02669027d9c94227b8a28f61f2b6e3c7.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_ffde1d4306ee4f7aaa6db513e8e47ed8.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_6733e53b504f40a4a258f982a50b51da.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_9d8307b0827649c98ce9e7a273849c44.pdf?index=trueIn PDF document text
    • http://xovajiw.rf.gd/76275721778.pdfIn PDF document text
    • http://nojubeweba.epizy.com/center_table_in_form_html.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/ramiwizabanigenipu.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/kopigakoxepabanijavoka.pdfIn PDF document text
    • http://lifukobokana.rf.gd/2141175884.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_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 5832 bytes
SHA-256: 62e343dd7359be2aec66724702e8196aff3b414a8540609378c3128c703b2218
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 4848 bytes
SHA-256: c93355dd38be0c73546abc4ec23a1545cf983b472ee9f539611a1b5d8bc5cf0c
font_02_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 11128 bytes
SHA-256: 87c50f5add00d52e721856037689a24bcd85fda19ffa0f569c98dfc09b4167d8

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