Malicious PDF — malware analysis report

Static analysis result for SHA-256 1139f630967cea00…

MALICIOUS

PDF

78.0 KB Created: 2021-02-11 21:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5f4ad8c33175143194a2573f940c20c5 SHA-1: 2e6cd8b8bc56c3cb23f75ee81486da324ebf6045 SHA-256: 1139f630967cea0087452ed69c9e49d7cb0da1385387dcc823b94a6851660d10
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to potentially malicious or disposable domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

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
  • 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://crophysi.ru/123?utm_term=how+to+trade+warframe+xbox+one In PDF document text
    • https://cdn.sqhk.co/vojofarakiva/igZPugc/pinata_punishers_idle_clicker_games.pdfIn PDF document text
    • http://vatologox.iblogger.org/xopepevisipafupirigoge.pdfIn PDF document text
    • https://cdn.sqhk.co/xozawimepod/gdkggjf/naxutevujegopuved.pdfIn PDF document text
    • http://cleaner360.shop/wupisatizowolazenimuv1o92u.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/fX44DTI/house_life_3d_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/jhbsmhc/62295543639.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/9ix4xja/school_management_system_project_php_description.pdfIn PDF document text
    • http://gemajesubon.22web.org/barcode_font_128_b_free.pdfIn PDF document text
    • http://cg-designer.xyz/birthday_cake_decorations_for_baby_boyi0pz2.pdfIn PDF document text
    • http://italysummer.fun/62462166323n8eo5.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/c8hh9jf/gunnera_tinctoria_vs_manicata.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/fNGjhij/15809066347.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/V8sifgc/nixozuzomozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipobemimojogot.rf.gd/billboard_awards_2017_bts_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/rivevigaxodugadexubuw.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/angle_relationships_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/parquet_file_format_hdfs.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_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 2828 bytes
SHA-256: eec2311198495a4bc353016469730966835d49679daeed18a98faa9ab15954d4
font_01_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 5104 bytes
SHA-256: 6181d0fb192701d167b052941ae90e5eb04de6a9a5b906bc384356aff0dc393e
font_02_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 10876 bytes
SHA-256: 33b6301723f10744ed3652ca11c61622d3b0ad735180d7ba3895acb617f93a4b

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