Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f69c4bf413422c8…

MALICIOUS

PDF

70.8 KB Created: 2021-04-26 13:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b65888683e795db94c55003862b4f0fa SHA-1: 26fdfbb4e3cc7a7e9d8ccccb22657437affe0cc0 SHA-256: 5f69c4bf413422c837205302a7d5d3854ed83189ef1d275af0ad997611f28951
126 Risk Score

Malware Insights

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

The PDF document contains a lure related to Bluetooth earbud connectivity issues, directing users to a suspicious URL. The presence of numerous external URIs and a high ML classifier score indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=why+are+my+bluetooth+earbuds+not+connecting+to+each+other PDF link annotation
    • http://lumoxul.iblogger.org/70182904630.pdfIn PDF document text
    • http://rakamuxege.22web.org/encyclopedia_of_chart_patterns_por_thomas_bulkowski_portugus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_604b7afada015.pdfIn PDF document text
    • http://gifinibufenatar.medianewsonline.com/75746312690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475580/normal_604ba9b2650ca.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/62781899234.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/4144528261.pdfIn PDF document text
    • http://xaloraxudevej.iblogger.org/vakabinedovitokizesomuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_602a145ac8720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5ff20fe47d93a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowipakusese.epizy.com/cosco_scenera_deluxe.pdfIn PDF document text
    • http://pimifemegizak.epizy.com/58755912655.pdfIn PDF document text
    • http://loturorilod.rf.gd/unire_file_i_love.pdfIn PDF document text
    • http://biwedudomobi.epizy.com/rupizuvakejino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca0c060-6767-4d9a-9bfd-16d7e837bfae/mitrokhin_archive_lal_bahadur_shastri_in_hindi.pdfIn PDF document text
    • http://kegunujav.epizy.com/asphalt_8_airborne_hack_apk_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa0a7fe-b7d2-41c1-a363-de96a67566f5/can_cronbachs_alpha_be_negative.pdfIn PDF document text
    • http://kubimuze.rf.gd/pubakajipewudesidosejur.pdfIn PDF document text
    • http://fadirekobesi.rf.gd/79372567131.pdfIn PDF document text
    • http://rimalapotozuf.epizy.com/are_old_tvs_valuable.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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 5608 bytes
SHA-256: f06055942f8ba2d80978cbfc39fb51632fa288f101bb2a0588a90fa8f59e98b0
font_01_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 10640 bytes
SHA-256: b1a44a922d85c8425b9baaf2499f14a77a173f51b149c12693d6290c87c18105

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