Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a66e3d76dd7430a…

MALICIOUS

PDF

79.3 KB Created: 2021-04-18 09:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fdb9775f222e1ae710751f8210fba412 SHA-1: 7a6711203cf259d5636f0a337f24f5606eb9adcf SHA-256: 3a66e3d76dd7430ab6a130b978cb791a679244ec16483d8dbca8867998b92ed9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign, possibly leveraging SEO techniques to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://xajibur.ru/strik?utm_term=what+is+network+planning PDF link annotation
    • http://napojenewojiro.22web.org/chapter_9_preterite_and_imperfect_tenses_compared_worksheet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_60225b4888e4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372399/normal_6002ba7c0eff8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fc8e64740bd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495050/normal_60198eb3bd1a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_602da126c6399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486565/normal_6051ac0da75ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_60104b93b7859.pdfIn PDF document text
    • http://zupuvotan.22web.org/navuveledokitopazezewov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_600a5cfb8e8c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_60478bc55994f.pdfIn PDF document text
    • https://nixunirebexif.weebly.com/uploads/1/3/0/7/130776125/e9a6ca939efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_60434f5cc1350.pdfIn PDF document text
    • https://napuvenorabinu.weebly.com/uploads/1/3/4/4/134490891/likagagavizonewena.pdfIn PDF document text
    • https://moxitason.weebly.com/uploads/1/3/4/3/134384587/varofe_vefuxosozasis.pdfIn PDF document text
    • https://lemoxubasox.weebly.com/uploads/1/3/4/3/134329143/3463306.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_aaa23f443a5f462b868c32f78f21adbf.pdf?index=trueIn PDF document text
    • http://xulalozuvemuve.rf.gd/dead_or_alive_6_beta.pdfIn PDF document text
    • http://xatobopuxobaxat.rf.gd/31843679666.pdfIn PDF document text
    • http://jedafalakax.epizy.com/51771319668.pdfIn PDF document text
    • http://lumaxixi.epizy.com/carbs_in_sonic_pretzel_twist.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_29bc0ebdbe104ca6a35ab24a6ec451cb.pdf?index=trueIn PDF document text
    • http://janenukexozi.epizy.com/magic_the_gathering_sealed_deck_rules.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_babb5e6cec7d472980a711c94b440d4b.pdf?index=trueIn PDF document text
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_e78ded3cdb714ee6b87e02a41c99f9e2.pdf?index=trueIn PDF document text
    • http://melakevejemi.epizy.com/pharma_interview_questions_and_answers_for_freshers_free_download.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_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 5248 bytes
SHA-256: 46e72819d2184f7a8baa701ddb5b827e5ff4ea18e4e476c7b13f3287b7663f14
font_01_sfnt_off00010a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 10880 bytes
SHA-256: c7ddfb0a21faeddbd57fda2611f00f7672df3f22d89d22ccf6f12a3a88e1e127

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