Malicious PDF — malware analysis report

Static analysis result for SHA-256 8216e7c8604446b1…

MALICIOUS

PDF

75.4 KB Created: 2021-03-04 20:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 001ef3c3afc4a299fb94966132665643 SHA-1: cc0370e1324a6b9e087e51bf421aef32769dce66 SHA-256: 8216e7c8604446b1f7b1c2a3c791f4c99d08a0d5c26863f603ec5dfefd0f61c7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to obscure the true destination. The ML classifier and ClamAV detection strongly support this file being malicious, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=manual+de+calidad+iso+9001+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375351/normal_601f8e6417cd6.pdfIn PDF document text
    • http://tularafujebok.iblogger.org/96549002308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_600365204b1d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450630/normal_5fc978ea0e58c.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/afsar_full_movie_720p_hd.pdfIn PDF document text
    • http://zasasibibo.iblogger.org/93469928001.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/d0727743-0341-4e01-bbcc-fc09de1ee5e9/what_is_a_speakeasy_in_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e615de37-a209-4af1-83e8-0969aaa13499/guwerew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ffcde5c-5817-4f9c-bf27-63e2d10a42d7/nirarafonopagedu.pdfIn PDF document text
    • http://nejukiwipe.rf.gd/value_of_original_dungeons_and_dragons_books.pdfIn PDF document text
    • http://nubomozakazir.epizy.com/juxabipup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147f5c1f-f9e0-4706-9c95-0c3b58014c89/bedajamarijulawijozapo.pdfIn PDF document text
    • http://lusabugisesoj.rf.gd/vavebejasibubuvokevoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe10e13-7580-4a4c-91f1-84c74a503efe/bemopikesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fee7283-d5d4-414b-a970-1566469d6bc6/bobekobadubetodepodavezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f9e256-38ca-48c0-835e-d8be99e26c97/whirlpool_duet_steam_washer_troubleshooting.pdfIn PDF document text
    • http://roxutudutupit.epizy.com/apa_format_citing_page_numbers.pdfIn PDF document text
    • http://zejagal.rf.gd/vitijitobamidizemofezalaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94854f55-9bb5-4e69-afdd-f8f60ad56e7b/fibevobufirovaribilutip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339c46e5-a17e-47da-8976-c51c84fa3c7f/how_can_i_tell_how_old_my_ao_smith_water_heater_is.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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 5408 bytes
SHA-256: 3aac31872aff8a3dfa80bb326902fa57c8470eeabdfadc260e47c5f733778f2c
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10404 bytes
SHA-256: ee6b472d221d9ea669176a012593bbf772e2e811cbc60447ba0f63a381b9578d

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