Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b988f4ada64df1…

MALICIOUS

PDF

88.2 KB Created: 2021-04-01 11:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7f09c24467f845c4db49534fe6aed3a1 SHA-1: 54a31dfdfc53facceadd17dcb8fa5f7c0c172a9e SHA-256: 04b988f4ada64df17eea817cb797816edb0d6d166a57fdfb88c3b4a1c0231a2f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://dafemum.ru/award?keyword=advocate+personality+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426257/normal_5febb201024d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_605d930d7025c.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/jexif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461219/normal_5ff3f011641c3.pdfIn PDF document text
    • http://sitonuba.mypressonline.com/79065496639.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/dJihse3/83133914879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_60542b375628c.pdfIn PDF document text
    • http://my-favshopd.online/the_ghost_in_the_machine_meaning8glmn.pdfIn PDF document text
    • https://cdn.sqhk.co/dirodivive/6jnWYib/sanikiniwozete.pdfIn PDF document text
    • http://meetsoda.club/zotokirizonadorizubatolfv3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_6028eff3e4930.pdfIn PDF document text
    • http://serovakarara.mygamesonline.org/international_accounting_principles_and_standards.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_b4cb2ac66d814316b88f3a3c9c2a2515.pdf?index=trueIn PDF document text
    • http://kubuxakul.epizy.com/chuyn_file_sang_jpg_online_min_ph.pdfIn PDF document text
    • http://nekapiv.epizy.com/campfire_songs_chords.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_acfe08b99e2e4e9ab87e2dfede7932bf.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_779343e4763f4a7bb402cb8399550139.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_3f9ba358a42b4e26925fa8dc7edfb797.pdf?index=trueIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_7c32396036984147baa3de86b8fd213c.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_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 5300 bytes
SHA-256: 3ca0d95c79bfb7230288b084242dbff862fb8f5408a5b0443b8554a8110b5660
font_01_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 24796 bytes
SHA-256: a0788020b4d97b2cdd8c80a24a1c18273cc41ca17648821a28ef9a88beda3393

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