Malicious PDF — malware analysis report

Static analysis result for SHA-256 923d8a9f6fd83380…

MALICIOUS

PDF

88.5 KB Created: 2021-03-22 10:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 446895e4f9992c0fc71118ef40d87e0f SHA-1: 5e32dfc2553f5f1eb75c1e55d84755c79e43cace SHA-256: 923d8a9f6fd83380011e51765489919c115c3a967c68c11758bf18eadc66dae2
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, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards the use of embedded links to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=how+to+start+a+honda+gcv160 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5ff6807018b1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_600ef650cb1c4.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/38619977280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_601842ac2b975.pdfIn PDF document text
    • https://goweruvewej.weebly.com/uploads/1/3/6/0/136015665/8044713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_60259079bba05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fde9329293f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5fc72eda1a426.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/attachment_theory_in_practice.pdfIn PDF document text
    • https://bivolureru.weebly.com/uploads/1/3/4/5/134583024/ponaputunarejozes.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/nikinatigixajubesojo.pdfIn PDF document text
    • https://lanufirosonez.weebly.com/uploads/1/3/4/7/134704233/ce60f3.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/resumen_corto_de_la_obra_lazarillo_de_tormes.pdfIn PDF document text
    • https://wojamoze.weebly.com/uploads/1/3/4/4/134479738/zazoxon.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/reading_and_writing_curriculum_guide_grade_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_60135e69c2a0b.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/subordinating_conjunction_exercises.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/80374982046.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/45554734527.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/wezejubomabakozarupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_13a315dc453244b0b069ec8165c9d8c9.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_3bf5424d9ee54320a7dbc2c6603783ef.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_d3cbd317f68d4651b7d31f5b677be925.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_8e6c642e80aa48d3a05384d78a01145f.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_d2ed34bf1f414d69982cfcbafa11c632.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_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 5632 bytes
SHA-256: bd557ef2e791c8cca4528f87017b11b75f8f800fac6c4cb3b207adec32df1dc5
font_01_sfnt_off00012fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 10776 bytes
SHA-256: b18122c6f6a44f02a4e653355873a596e8fbc484cc429bf84e61183958140cf9

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