Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1d1f0d728c37dc…

MALICIOUS

PDF

75.4 KB Created: 2021-02-15 18:27:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d4380c524d1e582109ec1fd4d1c7b766 SHA-1: bdf29b6cd513a3bd1eac3de0fbe769220996ad55 SHA-256: 5c1d1f0d728c37dc5929dbcd3d8309a3a335353ce5a1293e307fe652513168c7
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://jacksth.ru/strik', which is likely a phishing or malware distribution URL. The PDF also exhibits characteristics of a link farm on disposable hosting, further suggesting malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/strik?utm_term=what+else+can+i+do+with+a+breakfast+nook PDF link annotation
    • http://kobasobapina.22web.org/zurizije.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/soul_music_blogspot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_601b2f2cdbbf7.pdfIn PDF document text
    • http://xomapometafa.iblogger.org/bihari_sala_aankh_mare_dj_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_601564839be55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5fc63f4301d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_601e99536951d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafonabikox.rf.gd/31658032575.pdfIn PDF document text
    • http://pikididubemet.epizy.com/outlook_desktop_calendar_not_syncing_with_android.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/spotify_premium_apk_cracked_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/79914861003.pdfIn PDF document text
    • http://palomidifigur.epizy.com/brushing_your_teeth_worksheets_elementary.pdfIn PDF document text
    • http://jevoxomififewi.epizy.com/action_verbs_worksheet_for_3rd_grade.pdfIn PDF document text
    • http://faxumev.epizy.com/defib.pdfIn PDF document text
    • http://terojujulemon.rf.gd/lepobox.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/name_and_email_address_sign_up_sheet.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_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 5416 bytes
SHA-256: 18bf0f6a0396b152a71c085b047228811e9ed24cd63d30e549d4ab4150c0ee46
font_01_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 10068 bytes
SHA-256: 628b41c8349308be06a65b50fe5a948a9410b1cb297db3ab9032acc931e3a95b

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