Malicious PDF — malware analysis report

Static analysis result for SHA-256 feaac6a441a2f941…

MALICIOUS

PDF

77.7 KB Created: 2021-01-11 12:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b2b965d5ad7e832c199091608eb5902f SHA-1: c44fded4e3f38c97e8dcc4ddebb8b1dd9a9dbee6 SHA-256: feaac6a441a2f941c4fdaa63169477d54101b0f3dae3e2c232d0aee2e4773f3d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links pointing to external PDF documents hosted on various domains, many of which appear to be disposable. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was heavily truncated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/aws?utm_term=raid+5+degraded+mode+performance+optimization In PDF document text
    • https://site-1168274.mozfiles.com/files/1168274/guide_for_among_us_tips_and_trick.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/jgp4hfh/castle_farms_concerts.pdfIn PDF document text
    • https://site-1168486.mozfiles.com/files/1168486/epic_battle_simulator_1_apk_hile.pdfIn PDF document text
    • https://bixunirejo.weebly.com/uploads/1/3/5/3/135329058/1830436.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/hcMQFgg/75495068273.pdfIn PDF document text
    • https://site-1166659.mozfiles.com/files/1166659/fibaresafoputo.pdfIn PDF document text
    • https://site-1212417.mozfiles.com/files/1212417/gejetujafanixobawufutu.pdfIn PDF document text
    • https://site-1178351.mozfiles.com/files/1178351/happy_birthday_cake_pictures_with_name_and_photo.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/ienhbwn/descargar_grim_soul_dark_fantasy_survival_hackeado.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/fha9hhy/music_mp3_player.pdfIn PDF document text
    • https://site-1178309.mozfiles.com/files/1178309/color_push_ride_bump_ball_3d_print.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5448 bytes
SHA-256: 86def7b9a0adb14e245288158b60b3f01788bfb8381f00f5e718978f6be87022
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 10760 bytes
SHA-256: b9eda976a4ce20aebd24e990f1607dd8a64f94e60d4162073a865dcc13388366

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