Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b579070f1d7598…

MALICIOUS

PDF

71.9 KB Created: 2021-03-15 23:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9254950e41f471f608783d7576052878 SHA-1: 840f1dcbdbe23641c10da27ee55b93cff0e6d609 SHA-256: 35b579070f1d7598e2cfd99181ddf119accd88b574580911f625bb292897ddc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gimoguvi.ru/123?utm_term=cadet+college+rawalpindi+admission+form+2018 PDF link annotation
    • http://reflectionss.space/velifivop5pen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_6024591b7fac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_6013088c81af9.pdfIn PDF document text
    • http://jinoxiresajigeb.iblogger.org/tamifozulawarisovadaxuna.pdfIn PDF document text
    • http://sorulaxawo.iblogger.org/wuxujoluwuwimududug.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/gurewaborijisosiganedite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_603490c61451e.pdfIn PDF document text
    • http://idealsit.space/82032660034bymh9.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/what_is_the_newest_lg_cell_phone.pdfIn PDF document text
    • http://daimontimur.org/can_b_positive_blood_type_eat_turkey8ryxn.pdfIn PDF document text
    • http://viputixezererej.66ghz.com/cengel_transferencia_de_calor_descargar.pdfIn PDF document text
    • http://itanto.space/wukiz3wc6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fe0a59c4db5b.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/soburudejiver.pdfIn PDF document text
    • http://lizuzezusad.medianewsonline.com/bergey_s_manual_of_systematic_bacteriology_volume_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489409/normal_5fc7fe96613ea.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/how_to_use_easy_movie_maker_windows_10.pdfIn PDF document text
    • http://starkrobotics.org/tetegiaxso9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_279cfee730814e498f7a7096c2e71a49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5757fc73-fd88-41ca-b375-c23bbdf4ebca/clasificacion_de_las_cuentas_de_ingresos_y_gastos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19316729-ff10-4a6c-b750-399bbc2b4506/85090026387.pdfIn PDF document text
    • http://velevemi.epizy.com/jozukeramomejorilasux.pdfIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_196ce3e7ba80402c8f08ebd54a4c036b.pdf?index=trueIn PDF document text
    • http://wisunomimat.epizy.com/pudubipom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24614ad2-ed84-4a46-924f-19092d8c98f5/what_is_destiny_quotes.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_eb21698e8af34280b0d8b7fc19f65806.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/353cb833-b64e-496e-b3fd-fece0dd57591/41135158360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f41d07-f71c-4d45-8b8f-84bc95038eb8/does_illinois_tax_your_retirement_income.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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 5992 bytes
SHA-256: 9f6670bd85fef4b23b6f5db552f437ff15dd1162210d7812ce1309e1df1d6ed1
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 10300 bytes
SHA-256: 6f3af2dcd00c62dad8a7d28a860f0aba777d269ca3777dfe79623281b63d4991