Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97aa43a605213a6…

MALICIOUS

PDF

77.2 KB Created: 2021-04-12 02:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c1ea4ac26d3ae1c864445829218200a4 SHA-1: 9d192bc8a9c8bc9a794de07b5989bfe917e9472a SHA-256: f97aa43a605213a6ace59da6963440e0674067bd68ce19a5363308eafdee5618
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or SEO poisoning tactic. Several heuristics indicate the presence of invisible CAPTCHA-themed links designed to lure users into clicking, likely leading to credential harvesting or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://pelibifir.ru/strik?utm_term=ionic+pro+turbo+ta500+ionic+room+air+purifier PDF link annotation
    • https://jumedewumeba.weebly.com/uploads/1/3/4/3/134310957/8647bda.pdfIn PDF document text
    • http://romeita.space/vubekiwologoh0zot.pdfIn PDF document text
    • https://razesupimo.weebly.com/uploads/1/3/2/8/132815812/4313105.pdfIn PDF document text
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/84c452.pdfIn PDF document text
    • http://rmk4sale.xyz/vikinaxuluvari29i74.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/gggdibj/setobonuwije.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/1696125.pdfIn PDF document text
    • https://vifomamup.weebly.com/uploads/1/3/1/1/131163898/baxuwi_lomamavejola_jigowoweserex.pdfIn PDF document text
    • http://repair-kompov.ru/scientific_notation_puzzle_worksheetiwiqg.pdfIn PDF document text
    • https://cdn.sqhk.co/pelemobi/jhegdii/rijepular.pdfIn PDF document text
    • https://bumufufumobumag.weebly.com/uploads/1/3/2/8/132815806/wutevidav.pdfIn PDF document text
    • http://arboozfilm.com/38016898985bizg8.pdfIn PDF document text
    • https://vobilafulov.weebly.com/uploads/1/3/4/9/134902573/rufebur.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/towakog/google_captcha_wordpress_contact_form_7.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/daxukomigepazidiniliga.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/94430659716.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/xivefeluwogupesewu.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/21_day_sugar_detox_soup_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/5348713297.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 5292 bytes
SHA-256: 0a9c6f883b10788275d1606d4869279a35e8eaac62415e6c45a837f4b38a4e65
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 11992 bytes
SHA-256: ddce330ecf685c89c00383950ca7837bc0e8530d890eedd8546a32b23455378f

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