Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4ac21216bf4d9e…

MALICIOUS

PDF

77.4 KB Created: 2021-04-08 08:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 39167b8e99fec853cfc117def5ab0262 SHA-1: 57fe5f386466b61858c04c573dc50891b96bbafc SHA-256: 8d4ac21216bf4d9e15283ed6a036301ae9ca19a090e47df9a32c3d1a26e1beac
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous disposable hosting domains. The embedded URL 'https://soxebez.ru/123?utm_term=magnesium+chloride+form+ionic+bond' is a primary indicator of the malicious redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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://soxebez.ru/123?utm_term=magnesium+chloride+form+ionic+bond PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443804/normal_6049bd9854e6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_6016c13321e92.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/dolukunafawubunikusas.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/jizewibotatutobuket.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5ff53ff11582c.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/andres_segovia_partituras.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/jofoxotusajikina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_5fd9bb06c400d.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/15515740798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_602de602a5fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_604cc44016309.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/angielski_czasy_budowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422893/normal_5fcf3ef96e880.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/baldor_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_600e38d2e7f44.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/how_to_charge_my_mophie_juice_pack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_6010836fceedf.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/lowolikonixozopamif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465719/normal_5fec680e3acfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_5fd2269163ec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_603f8acdbb670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_604441b5418fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ae9c08-8ba6-4e44-a68b-0c20c150a761/how_old_do_you_have_to_be_to_get_your_learners_permit_in_south_carolina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7735cc10-4244-4423-8f26-e4457833d9c3/what_is_the_difference_between_correlation_and_regression_compare_and_contrast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d622b31-dcae-4ec0-b2bc-4fa6b8082beb/luzimorepevutinuxuwogos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f66811-1633-468f-b334-b037b9b20ee5/5489805296.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_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 5580 bytes
SHA-256: f66e592d51020b8ed42215863dc5376b79827b1b4335afd2795f0b8ed440bfcb
font_01_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 10532 bytes
SHA-256: 25f717aa2232b11f402668f180d457d17e7641d6771d2bf2eb45ba3bceef9092