Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7dc8f2957e6566…

MALICIOUS

PDF

88.9 KB Created: 2021-03-20 17:26:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 10a75d2c6eeae2566a1a6fa03e798616 SHA-1: 21427d06b743e596fbef373f874e8a4cbc5a45f2 SHA-256: 7c7dc8f2957e6566ac24b9483f98f63c833deec694b2539bc99ad4c49c44d1ba
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, pointing towards phishing or malware distribution. The embedded URLs, such as 'https://midufefew.ru/strik?utm_term=minolta+maxxum+7000+internal+battery', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=minolta+maxxum+7000+internal+battery PDF link annotation
    • http://limecash.xyz/vujojuliwikuravu8b58l.pdfIn PDF document text
    • https://cdn.sqhk.co/fonazovep/iiYihCq/26964985597.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/what_is_a_narrative_in_a_filmf0ave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_602f2eb4d1f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_603a0565b79ed.pdfIn PDF document text
    • http://itagreen.fun/invisible_influence_jonah_berger97oof.pdfIn PDF document text
    • http://fartook.online/axios_post_x-_www-_form-_urlencodedj4skh.pdfIn PDF document text
    • https://cdn.sqhk.co/dikonutudibe/jcgewmV/chatuchak_guide_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rapaxino/rZYghh7/modowenenerapog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_0ea331fed78d45578038a5da01e26e56.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/piwosigamivasivobusav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20297d7-0071-4d0d-86ea-9ac89b119d1a/18176309006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ed745b-81fe-44ab-91ac-89d28f322f5c/ancient_greek_gods_lesson_ks2.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_fdefcb6498394a118db1998b6935b3ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5746cd2-2e45-49bd-b4b3-87f31625ff26/fefoxujawaxuwu.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_38a3152965424ecdaf7bc91a7a96e2c6.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_6a47f89f83e543dba57780372fb62741.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/himno_de_honduras_7_estrofas.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/binary_converter_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/butterball_xl_turkey_fryer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7400e3e-0d89-41c8-b73a-a6700aceedd0/32698273859.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_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 5188 bytes
SHA-256: c9db8223c5778424a5f1e028e709eb706c8dea917b15a1ea9b5709b5c2a62bd1
font_01_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 11820 bytes
SHA-256: 9521b67feb5f5fd52a19850709ead12b3f3ae8fa7e19bce7819463520ef34d5b

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