Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5c32c55a27d968…

MALICIOUS

PDF

80.3 KB Created: 2021-05-02 18:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e96cb5bfab1b9363eaf79b9dd694649a SHA-1: 113f4d019cfbf91cd886eeb7040da3ac54e63dbc SHA-256: db5c32c55a27d96873d73cae5dd50ab7d20528e3ab93012473cd2a18db70d547
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=is+dyson+v10+animal+worth+it PDF link annotation
    • http://jupofara.22web.org/crossing_over_and_recombination_in_meiosis.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/hdLjdje/traxxas_link_won_t_connect_to_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/fGgfGjc/formula_1_istanbul_2020_biletleri.pdfIn PDF document text
    • https://cdn.sqhk.co/xadelakora/heMLn0u/tukibaxidemoxavusekaxuv.pdfIn PDF document text
    • http://dreabling.online/crystal_reports_calculate_date_difference_in_days5pfqa.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/88275423161.pdfIn PDF document text
    • http://tesocoin.online/visualizing_reading_strategy_worksheetk6l43.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/33538947019wjh4g.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/fLAf5hd/rivebare.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/47241621494.pdfIn PDF document text
    • http://fasad-dom.site/wekotofutizqbjoj.pdfIn PDF document text
    • http://baugroup.info/plantronics_voyager_pro_eartips9ru77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvowafavij.epizy.com/dakivilujiguwoxumew.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_d57286db41a0489fa78e49427bd96767.pdf?index=trueIn PDF document text
    • http://kidejuwukaj.epizy.com/lizotemalamipewamarej.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_db2a057ca9e743e29065b4853d33bbf1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/22737034426.pdfIn PDF document text
    • http://kikogam.rf.gd/biodegradable_polymers.pdfIn PDF document text
    • http://fuxuxasezid.atwebpages.com/algebra_2_statistics_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/98576435896.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/8000682692.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_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 5452 bytes
SHA-256: 581372bed4f70902da77d3707822d489d3ae0df0a1887bee5a6b9b0ad789f7c1
font_01_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 11672 bytes
SHA-256: a5e36cac1a2a3f9453565427746c348ef4f7023e16d37fdf9c4756762046ac8b

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