Malicious PDF — malware analysis report

Static analysis result for SHA-256 991908957fc4dba1…

MALICIOUS

PDF

68.4 KB Created: 2021-02-22 19:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 70a7b1da43c1c36abffcd193bbde61ba SHA-1: 5975d1a40d0118bb2e94a8c4efee07146cfc797e SHA-256: 991908957fc4dba1718cd31a3bb82f9be0ccb7b3dea48077c4a8db1932f3a781
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs points towards an attempt to redirect users to potentially malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=english+1010+pgcc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488090/normal_602fdea971038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_60307dc8a5037.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/wo2gdge/fewowaralisegar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475580/normal_5fc98b86239eb.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/djbhaja/amazeum_in_bentonville_ar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_60111ab0292a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_6031da753fd83.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/7gfygfY/21994715204.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/Dzifchh/80579019453.pdfIn PDF document text
    • https://zebomutob.weebly.com/uploads/1/3/2/6/132696512/50ebd94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jovesupegomiz.epizy.com/vectors_physics_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/fofojavomujoxadesevolada.pdfIn PDF document text
    • http://zugujegezamuto.epizy.com/29525941870.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/darling_movie_theme_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/dexulolajinogeworixeno.pdfIn PDF document text
    • http://ruxunuweni.epizy.com/how_to_do_fault_tree_analysis_example.pdfIn PDF document text
    • http://radisabuvaba.epizy.com/97817353327.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/32148060240.pdfIn PDF document text
    • http://tijopuzotozume.rf.gd/nogegofuzutoxojuvozo.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_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 5040 bytes
SHA-256: 004629a0385ef1115dd4293d2a0288be9b5033500647e61a7cc6e96a77a5f300
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 10596 bytes
SHA-256: 08d26607c112ee33347afaa824de466890ed8bd9c30add41bdec9e05984eac8b

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