Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b00b5ee58a6f58…

MALICIOUS

PDF

72.2 KB Created: 2021-02-05 23:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 463df9d26f84b28e85ed90f1977c9c3b SHA-1: 193b54ed81bd78efbe1242bf34a0e626a2323744 SHA-256: 04b00b5ee58a6f58f8bc6ed43665aa7dba4edcba4d4e73de9e6b792da518cb18
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure for a "concierto aranjuez full score pdf", likely to drive traffic to malicious sites.

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/square?utm_term=concierto+aranjuez+full+score+pdf PDF link annotation
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/5044bf942d40d.pdfIn PDF document text
    • http://all-system7.work/uncitral_arbitration_rules_2018u73aw.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/ibz0I4j/femerupawaxovajanivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fd61026c3650.pdfIn PDF document text
    • http://intereriia.com/250316508495os1p.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/cSgeVZ2/13473726035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5fe652282861f.pdfIn PDF document text
    • http://girlita.space/warhammer_roleplay2zv5j.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/Ogi2kmI/war_robots_animation_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/hcFVbGq/zefozagukudumesesimetiloz.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/b6jcrzi/remove_curse_of_binding.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/jujedapanozat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5fd6a6f280c9b.pdfIn PDF document text
    • http://bred-enligne.com/keune_tinta_color_chartio0k5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fccfd80d3e57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/jilikerevifaguwimebeki.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/form_a1_pajak_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/interior_architecture_group_books_free.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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 5180 bytes
SHA-256: 52831ee7b3951be5b7cbf4419f91d6869c8ec609af024f4ab6ca2e5babbd77c9
font_01_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 11028 bytes
SHA-256: 58a4782136796bea320b4897c04dd9e850b7b53bd452b283b3411c810a22fa30

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