Malicious PDF — malware analysis report

Static analysis result for SHA-256 04679c2129f11fa7…

MALICIOUS

PDF

86.9 KB Created: 2021-05-17 08:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 905001b58d87bb3dc05621a566ff48c5 SHA-1: 4b520e1a91aaa41087b62873039ba3c8e9afa968 SHA-256: 04679c2129f11fa7f1f8c9eac3822ba50f01959fa28363c122b7bfc55bb1af09
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to host phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=kenmore+electric+range+model+number+790
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/4097871.pdf
    • http://ketadiets.site/23590485078vwlhe.pdf
    • https://rorenaziva.weebly.com/uploads/1/3/1/8/131871817/131673.pdf
    • http://magic-world.site/troy_bilt_pony_mower_deck_belt_diagram4t4oj.pdf
    • http://sedisifoxe.22web.org/rosabiwujepimo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/najubu/wolidibezezerilagob.pdf
    • https://uploads.strikinglycdn.com/files/45cbf088-eab1-4449-91d7-10e2977fd5c7/83479548257.pdf
    • https://uploads.strikinglycdn.com/files/92e5a221-d733-4378-ad0f-7cf4bc4b2fa5/why_use_graphs_to_display_data.pdf
    • https://s3.amazonaws.com/faduxodiwo/b_ed_form_date_2019_rajasthan_university.pdf
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_8bdd3f34bc6d4c32bd1fe4506cd281c7.pdf?index=true
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_046a9faabca343fba61b6fc88a39dccf.pdf?index=true
    • https://s3.amazonaws.com/pobixedele/talexigufojirejul.pdf
    • http://vulikoviluxugu.rf.gd/lirinodekufuwixav.pdf
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_54abd16447314414bd76c8bc65e37f63.pdf?index=true
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_a1e621b549e3442bb384baa6b0061a4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45630be2-daa0-4737-9bd0-7e07b64f059b/what_is_the_lifetime_of_a_refrigerator.pdf
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_7ac0438d12c14b7fb520d6dacf6a22e5.pdf?index=true
    • http://diwomikutaz.epizy.com/zeboberuweres.pdf
    • https://s3.amazonaws.com/kotodur/33619468832.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114d8.bin
14ac2c69cb0a621204efd62bcbb21126a13dfc640dcfe5e7835be4416ba48f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 5568 bytes
font_01_sfnt_off000127b5.bin
5ef05ca16f10b87f74ac00461719d6dd3b8d44651be9c9b3836ebeaafe7470ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 11268 bytes

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