Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fac8206a19503a…

MALICIOUS

PDF

115.9 KB Created: 2021-03-29 13:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 76692e936f8a34aa4f2af3cb723304fb SHA-1: 41c855a173045d9b40ecdba59222c895dc698717 SHA-256: a1fac8206a19503a663838dba3891a880957ae308c5c36f3b4912ed99bb08581
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM'. Many of these links point to unknown or potentially malicious domains, suggesting a tactic to manipulate search engine results or redirect users to harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=diary+of+an+awesome+friendly+kid+book+2 PDF link annotation
    • http://instasurprise.online/boy_scout_personal_management_merit_badge_requirementsk5y1w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_6029356635680.pdfIn PDF document text
    • https://sefagovat.weebly.com/uploads/1/3/4/4/134402874/rewojoxisutebarozowu.pdfIn PDF document text
    • http://tomogorman.com/net_technical_lead_interview_questions_and_answers4p12h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_6013c72ec93ed.pdfIn PDF document text
    • http://lifegirls.site/how_long_does_disability_determination_services_takevk7pv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448735/normal_5fc654f61e309.pdfIn PDF document text
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/zodevibalep.pdfIn PDF document text
    • http://sberin.xyz/49064248099ja9e1.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/fulosobezur/is_green_tip_ammo_legal_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/tabelakoleniwekizuzosiger.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/79220558768.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/asus_dsl-n66u_router_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/67196730544.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_38f3036544dc447bbb51d8a8180a5ac6.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_a6cd3186a6a747ddb0d23eb5b2c2dbb3.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_e1b9b3d2ba294f53b81df83edce481a5.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_0a7e506a20fe4a3b9dc1e285cfa704e8.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_22ff9f3d826049818f4fc3d9db8af849.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_b2c4617939054c59aeadfe63cee05db8.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_c0486f90a94440779e2a29c168a53768.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_e8eef425222d442a936445d66be1768f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F91 5584 bytes
SHA-256: 716933aecbd8e1514fb4cbd19a0cbdf8ab2f58c4d5e9d80a151a455542088473
font_01_sfnt_off00019291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19291 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00019b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B1F 11208 bytes
SHA-256: 47f40722c20ca8c25075da7ea6943ecf984975681c225866755089984376dcfe

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