Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8364059585db03…

MALICIOUS

PDF

65.7 KB Created: 2021-03-16 22:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dea724729d7521878e314f8e0eb96d04 SHA-1: a3589758e7ecd02600a0af2e63bae66cd0742c5a SHA-256: 6e8364059585db0306df4f7a530cdce75e5bb2955d75b04225d47a6b915a15f1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many pointing to PDF files with numeric slugs, suggesting a link farm or SEO manipulation tactic. One prominent external URL is https://vilenefex.ru/strik?utm_term=how+to+improve+fitness+over+50, which is likely the primary lure. The document body is heavily obfuscated and appears to be a mix of metadata and corrupted text, but the presence of external links and the link farm heuristic strongly indicate a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+improve+fitness+over+50 PDF link annotation
    • https://cdn.sqhk.co/letareximo/ialMuJc/ai_sound_words_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/melivetipi/jsPriiT/rimozagatapururinepiv.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/jficuLp/78124070668.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/jXthbxi/65081317372.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/hbDhaih/jivuxoxitabejebiwejo.pdfIn PDF document text
    • https://dosevabif.weebly.com/uploads/1/3/1/6/131637409/6180725.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/NgdDKBE/93020266158.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/fifyagi/big_head_football_championship_mousebreaker.pdfIn PDF document text
    • https://jigukijovumide.weebly.com/uploads/1/3/0/7/130740363/vedogim_roxukudeda.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/Pxhiuhi/dasonabafaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d049fbac-70aa-4ba9-9afb-a289019ba82b/beratoseveviposusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbec0460-1dc9-44f8-8fbb-688bb5f8ce9b/what_does_it_mean_when_my_whirlpool_duet_washer_says_sud.pdfIn PDF document text
    • http://vonodese.epizy.com/ikea_brimnes_headboard_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c4ec4c-4c54-429c-a005-c20327cd4d55/devedexopetifovutefas.pdfIn PDF document text
    • http://sajonagot.rf.gd/carrier_air_cooled_chiller_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/lugoleponokozejilij.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/hungry_shark_evolution_cheats_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf7288f-fe1c-43b3-9db5-63ece8bf40e5/75125164205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4e289a-bc3c-4133-b6da-201f96be23a9/4314050879.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/diet_after_stroke_fact_sheet_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/what_does_the_doctor_say_lady_macbeth_needs.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_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 5184 bytes
SHA-256: 25007e09397a0becddd6f566ef59d96b21cfec721bf7fd591f44416be65e245a
font_01_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 9916 bytes
SHA-256: a79609f8ee89ed5d4c19b5889223660fe0248d15f49adc383a18b49826d55290

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