Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16a8fef179b79d3…

MALICIOUS

PDF

74.2 KB Created: 2021-02-25 21:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: bf5ec0953a314a79d0d7b3eab8242f88 SHA-1: 6fa73f58fecf175b43f2494eede94380c160b516 SHA-256: f16a8fef179b79d3e66208aed20a3b0ecc61f7d99fa98036d7f011561e73c7b0
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves redirecting users to potentially harmful websites.

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://bologen.ru/strik?utm_term=how+to+tie+a+square+knot+in+a+fleece+blanket PDF link annotation
    • https://xalorato.weebly.com/uploads/1/3/4/3/134317389/xezesujopewemowune.pdfIn PDF document text
    • http://kino-vezde.ru/humboldt_co_ca_jail_reports72cdb.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/barivereremanik_vavotev.pdfIn PDF document text
    • http://vazaferexadamaf.22web.org/bipibakidiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/fs0u7ij/live_voice_changer_no_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/gcgjcqH/sujuxovuvaju.pdfIn PDF document text
    • http://jifixadilo.22web.org/vixotal.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/jih0jbf/club_car_high_performance_engine.pdfIn PDF document text
    • https://perepori.weebly.com/uploads/1/3/4/0/134016710/5558767.pdfIn PDF document text
    • http://hookup681.site/117111137ihs93.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/mipefavudibob_mojisoro_dezadiwo.pdfIn PDF document text
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/41cf656364b131b.pdfIn PDF document text
    • https://xikipavukageza.weebly.com/uploads/1/3/0/7/130776529/benobatak.pdfIn PDF document text
    • http://difemetudanad.22web.org/spanish_to_english_worksheets_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapudajikipidem.epizy.com/roman_numerals_worksheet_answer_key.pdfIn PDF document text
    • http://pinavobanokewix.epizy.com/fujuz.pdfIn PDF document text
    • http://vineberute.epizy.com/zodejegidebumumonesazog.pdfIn PDF document text
    • http://tixumupugenatum.epizy.com/asterisk_war_opening_2_full.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_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 5260 bytes
SHA-256: 129260497a0d9cfb5a52b3b92d9ce40fde7a9831c0497c74b053e2ac085641f2
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 10012 bytes
SHA-256: 50c2009aad5a4e2e3bf85bf232a18e379127eeae6e6b80d512607c30b1401e95

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