Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a70941bb056346…

MALICIOUS

PDF

77.9 KB Created: 2021-01-22 21:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f0af72963d3517607b1c552dd7ad8360 SHA-1: 8c8f966246b777226bc120fbc0e601af9e79eca7 SHA-256: 51a70941bb056346df20a29798dce8af59f67816c5bdff7e31bd90a1b633781f
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=263+area+code+mauritius'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious URLs and the overall nature of the heuristics suggest a phishing or malware delivery attempt, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=263+area+code+mauritius In PDF document text
    • https://cdn.sqhk.co/sejejajoxej/giMhd8q/pilot_logbook_excel_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fe26947a7153.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/uKwtSjj/vubamosugota.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/cic3Tgg/parking_night_motorhome_campervans_uk.pdfIn PDF document text
    • http://runatem.66ghz.com/brother_mfc-_j6520dw_driver_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529149/normal_5fd3c499bcb23.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/gcBghSk/fox_sports_mexico_en_vivo_online_gratis.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/38819279482.pdfIn PDF document text
    • https://site-1172655.mozfiles.com/files/1172655/free_virus_scan_and_removal_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/jwIzsih/86006596412.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/Tgh6jje/mozobubalezis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jukezeluf/30338665535.pdfIn PDF document text
    • http://tunazafagid.epizy.com/chiasmata_formation_in_polytene_chromosome.pdfIn PDF document text
    • http://vubimefiz.epizy.com/72505758221.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/fepibunijaropubosurimi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 5184 bytes
SHA-256: 4ecdcdfc5336235655828b321456e91d155ef8e11c11f954ef5c2ceecf9292ec
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10768 bytes
SHA-256: 8e4de05f02c1d826181ddcf9477b32abc35ffb0f502382f64f645dbe2c4ba21d
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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