Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e5b398f0545013…

MALICIOUS

PDF

76.6 KB Created: 2021-02-20 15:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: af7034781f11b315476f8079dd18046e SHA-1: f812d851f99d15831f40cd672f22cc5e36212263 SHA-256: 11e5b398f0545013b672d40f56d46341a22763560fefc36edbb4947702ad16c3
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of 'utm_term' parameters in some URLs indicates a potential tracking or marketing-related lure, which is often used in phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=moog+slim+phatty+price PDF link annotation
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/lesadisizasixud_dupuxozut_dukizale.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/2016907.pdfIn PDF document text
    • https://pimetukuke.weebly.com/uploads/1/3/4/0/134017259/piremiso.pdfIn PDF document text
    • https://visuriteja.weebly.com/uploads/1/3/5/3/135323353/lekogafabipej-bifitalewejepo-tededun-bixitobudiw.pdfIn PDF document text
    • http://domastmsk.space/zulalagupulitadiwimapu56x.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/donojafopif_davuzikez_saladuboxafo.pdfIn PDF document text
    • http://cpskras.website/bensalem_police_accident_reports33qq1.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/5a997f4ee.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/kozibowisenatu/sig_sauer_p226_spring_airsoft_pistol_with_metal_slide_black.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/26157496581.pdfIn PDF document text
    • http://vatikob.epizy.com/11013191645.pdfIn PDF document text
    • http://potubavaziripek.epizy.com/river_durance_kayaking_guide.pdfIn PDF document text
    • http://xukenefurirog.epizy.com/amma_donga_songs_telugu_naa_songs.pdfIn PDF document text
    • http://jebebubijegew.rf.gd/gobevelakibedenazasene.pdfIn PDF document text
    • http://nekogepi.epizy.com/autodesk_autocad_2016_educational_version.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/gemitakatixojanoxokisu.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_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 5456 bytes
SHA-256: 6cc11e537c7fa6957f4661b0fec469731d2639519647d23038db79dd2cdbe56c
font_01_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 10320 bytes
SHA-256: 1b6aa340849ca99422420edcd59be5b7edc8c8f0b8ea25325e5ffa4aaa07768c

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