Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3320c53b951ca06…

MALICIOUS

PDF

79.1 KB Created: 2021-04-03 03:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 529f0319560d4f8253ff7b4523236627 SHA-1: 244f236511c194f9802b700bbb3f677abaa27c48 SHA-256: b3320c53b951ca0675c4c57a0e05787a82cc474dbd59e7730aa997dfebd119e5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to S3 buckets and other domains. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external links suggest an attempt to redirect users to potentially malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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=what+are+the+different+types+of+check+valves PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485313/normal_6034c0a1a4976.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/xowuteba.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/cardiovascular_disease_introduction.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5fff3979a7fd4.pdfIn PDF document text
    • https://jenisevemib.weebly.com/uploads/1/3/1/0/131070602/keripufevusonovofuje.pdfIn PDF document text
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/522036a013e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_6028ac06b284f.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/capitals_of_the_world_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_6055f9896fb85.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/5668499497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450624/normal_60151ea25b43f.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/1191401.pdfIn PDF document text
    • https://mifeweravu.weebly.com/uploads/1/3/0/8/130874314/vebizerimikaruf.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/wixanarer/rivujixokatuwuduzapedomen.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/what_is_my_peoplesoft_id_heb.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/xokakalavo.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/usb_borescope_endoscope_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/72338938110.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_21c93ee469034feb8ae345d0328cffb6.pdf?index=trueIn PDF document text
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_7fb7fdf26a1741daba46b051add6954c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunojipu/how_to_install_petsafe_in_ground_fence.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/android_studio_how_to_install_build_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/1788187669.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/msi_z87-g45_gaming_drivers_windows_10.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_b70cf28688ef47a9a4c4665351b6af57.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 5484 bytes
SHA-256: 66ef02e54b33d34c65ff84f3128f1f858784e866f04ac5bc2587da6fce0bcaf1
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 10496 bytes
SHA-256: 622c668369615eee0ae732afd0b348e2636daa304663f04a3a9c688dad6d5215

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