Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7124801938125d9…

MALICIOUS

PDF

77.6 KB Created: 2021-01-13 03:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 06db25cf435de2c32ef874e846d7e362 SHA-1: 792e381c9e676983dd940ebef687525c0bb27076 SHA-256: a7124801938125d986aaa336fbf2200004bf1c2562136cd8073564916449c974
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to lure users to external content, likely for phishing or malware download.

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://trafffi.ru/123?utm_term=flexible+duct+connector+canvas PDF link annotation
    • https://site-1179443.mozfiles.com/files/1179443/kofavutonovitasupit.pdfIn PDF document text
    • https://pitubesisimebi.weebly.com/uploads/1/3/2/6/132681325/binurewobexebuxi.pdfIn PDF document text
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/8080587e4d92b0c.pdfIn PDF document text
    • https://site-1178836.mozfiles.com/files/1178836/94382795429.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/csir_net_syllabus_for_mathematics_2020.pdfIn PDF document text
    • https://site-1176116.mozfiles.com/files/1176116/best_ringtone_for_my_phone.pdfIn PDF document text
    • https://site-1172728.mozfiles.com/files/1172728/lamivazezo.pdfIn PDF document text
    • https://site-1167993.mozfiles.com/files/1167993/apa_referencing_guide_two_authors.pdfIn PDF document text
    • https://site-1177769.mozfiles.com/files/1177769/68593586027.pdfIn PDF document text
    • https://site-1083673.mozfiles.com/files/1083673/nizolubabagemejigalupur.pdfIn PDF document text
    • https://site-1193440.mozfiles.com/files/1193440/wuzurupe.pdfIn PDF document text
    • https://site-1176958.mozfiles.com/files/1176958/king_kong_full_game_download_pc.pdfIn PDF document text
    • https://site-1174227.mozfiles.com/files/1174227/kobe_at_lebron_game_last_night.pdfIn PDF document text
    • https://site-1172428.mozfiles.com/files/1172428/learn_c_programming_by_making_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potofaw/wotegidilekimado.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_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 3892 bytes
SHA-256: 3244f64a543c3812e189cdf82a9a4d157f17c6f4dba6811d0f13f17c5cb52087
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 5156 bytes
SHA-256: f100e49ffccb6b9a0df380667e517f4f189bba470574306805b9eb9f3a19c267
font_02_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 10372 bytes
SHA-256: db49b5384bad4fb07fbc4b51f38e179bb33cb0ee4d1a64f7c115123496a5d1fe

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