Malicious PDF — malware analysis report

Static analysis result for SHA-256 27854a9ee2e836a2…

MALICIOUS

PDF

66.6 KB Created: 2021-03-18 01:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 531b38e8c494d00b65ee0d9f726a1210 SHA-1: 454292505e31335289e831070d47c27a431d7f2b SHA-256: 27854a9ee2e836a266565762a223fcd8d2f95d8625f8315b30eb47d556c8d7f1
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The presence of 'ML_NYX_PDF_MALICIOUS' and ClamAV detection further supports the malicious classification. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to facilitate initial access via spearphishing, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8523

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://jumiwimov.ru/aws?utm_term=technical+drawing+definition+and+examples+pdf PDF link annotation
    • http://lupelisizi.medianewsonline.com/dia_de_la_constitucion_mexicana_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_60296b90e88e0.pdfIn PDF document text
    • https://wagidojinubem.weebly.com/uploads/1/3/1/4/131438567/korawopikaduvab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_601470a719e9b.pdfIn PDF document text
    • https://subefurova.weebly.com/uploads/1/3/4/5/134505332/bibegutukaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_60294247e6205.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/tamil_to_english_learning_books_free_download.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/gizij_satitum_fufer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471256/normal_604329093c309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_604006cacf415.pdfIn PDF document text
    • http://mozafebafurekuk.iblogger.org/what_does_human_trials_mean.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/b6b70290-9812-4df5-b6dc-62cb030581e6/directv_genie_not_connecting_to_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a8a180-8b9d-4ffe-b33b-b65770f89fae/what_is_the_best_waffle_maker_for_the_price.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/libro_budismo_esoterico.pdfIn PDF document text
    • http://mafifupep.epizy.com/19267027366.pdfIn PDF document text
    • http://laxufazekez.atwebpages.com/zoginaxebegitabufose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23aa6768-affd-4a92-ac64-8b96d18971e6/what_do_cherry_trees_look_like_in_summer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7564a458-2da2-4702-898f-b63ea3052619/fx-115es_plus_fraction_to_decimal.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 5676 bytes
SHA-256: 13a76de1aa6a50c0f04b9089e450f4e2bb536896c704b8ac77cad9f13a4d20c9

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