Malicious PDF — malware analysis report

Static analysis result for SHA-256 204bf60941ddf858…

MALICIOUS

PDF

72.2 KB Created: 2021-01-12 15:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2b9e58b417d435c1b1a5b92fafdedeb7 SHA-1: 91b34521929a8d1f6e31bfdd03c8d50b22e0fc65 SHA-256: 204bf60941ddf858ed5aa8ff1f59acc893dc36ee92a8641bbf69960c8234e33a
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 0.9997

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 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://trafficel.ru/aws?utm_term=celebrate+it+wedding+templates PDF link annotation
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/8335950.pdfIn PDF document text
    • https://site-1172607.mozfiles.com/files/1172607/guzosemiboworogagowi.pdfIn PDF document text
    • https://kibewuzogoluwiw.weebly.com/uploads/1/3/1/6/131636689/99dbf7a7df9e62c.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/tojawijonowowul-dogilov-bolizeratozo.pdfIn PDF document text
    • https://pozosukezogi.weebly.com/uploads/1/3/4/3/134386022/zepiwu_suzivunuboz_perebewisedate_kuxefalikugotus.pdfIn PDF document text
    • https://site-1168208.mozfiles.com/files/1168208/69291949.pdfIn PDF document text
    • https://site-1176351.mozfiles.com/files/1176351/pavumegiwapimafimiguse.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/laradusa/firefox_for_macbook_pro_retina.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/excel_wenn_funktion_farbe_ohne_bedingte_formatierung.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/nidozurawewopodola.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/simcity_cities_of_tomorrow_for_android.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_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 5416 bytes
SHA-256: 0e0983e103d53d8378b55d675e5f1ec075e3dbd21e437dbfea013e7f37fc1131
font_01_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 11436 bytes
SHA-256: f77c9d5c3c9efa153eecc5a2920d694847d95cda415fbe799019ee30656593a0

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