Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d638d2a5e27cdc9…

MALICIOUS

PDF

77.4 KB Created: 2021-03-10 15:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 062969170cd2de786034f69ecf0de60d SHA-1: 7165b671ed6186c406424d196e8e4edf46c1dfc7 SHA-256: 7d638d2a5e27cdc928d43d1a3ff79d8c282a44e9c1f429aca41fdddb870e3387
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious redirection or download workflow, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://botokaw.ru/123?utm_term=basshunter+now+you%2527+re+gone+album PDF link annotation
    • https://tedudizoz.weebly.com/uploads/1/3/2/6/132683188/duxuvopurev_nabuwezagabano_fodox_petajovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445736/normal_60037bb981da9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_603b6fed1165f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_60158c9b8b06e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_603f49b54bd93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_60254b6f693bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452837/normal_60259678ba342.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/bitapikezol.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/wexoteluwag/29868471544.pdfIn PDF document text
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_2bed61f6572348f7bf1abb4bf8112bed.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_62ce99e35e734db69da66d2440bb444e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/337e79f0-a9ff-4ad2-9c9e-c3fdee154712/judofufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/decc46dc-6c67-4c59-9e98-49ae5280c185/wekotajubapofowosaju.pdfIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_cec1336fbded4aa2995bdc8a5ac8cf2b.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_a157ca17d55c44f987af5f1400b760a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bojafazes/54489468293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0551132d-9b04-4131-a9ed-a33f6e0b65ee/best_weight_loss_tracker_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/gojuwuvap.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/video_birthday_invitation_maker_app_free.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_68a701dc01e84b84a5759c117a27ce10.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5516 bytes
SHA-256: 5e6d241fbdd8df50d003d00dd6f61cfd62cd07540793fb31e7ece322274624a8
font_01_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 15264 bytes
SHA-256: 1959a3996999dfba4ba55650386f07373f9cf366df87ceb432fb2690207c5cbe