Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d7eafbd7983147…

MALICIOUS

PDF

76.5 KB Created: 2021-01-01 05:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba1f7c6c950b54d3c990f96993b81a80 SHA-1: fa66cfc2182d284ca486105840e7c9ee1a817b94 SHA-256: c7d7eafbd7983147296f5f554c7cabca69bf60f9bb51b750f82c2ebb220fdd7d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous external links is the primary indicator of malicious activity.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=ballad+of+the+landlord+literary+devices In PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/6642326.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/sunemoril-zedowavevob.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/fisimot.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/9a08a.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/bijghaW/smart_tv_android_apk.pdfIn PDF document text
    • https://detatabuloto.weebly.com/uploads/1/3/5/3/135346227/fogatoxur.pdfIn PDF document text
    • https://cdn.sqhk.co/soxemudu/TgjAAom/kudujexavakubovu.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/sisaxu/75630222282.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/zigelulumalaxuboralinamup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b767687-9a15-4816-993f-45ac45e3cddb/sahamati_account_aggregator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b54da827-6f4b-4cc0-8454-b0333d1f70c3/13418536361.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/citra_android_games_not_showing.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/cool_math_games_run_33.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_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 5320 bytes
SHA-256: 6b4532748b158d8fe284cd70d1a86948856037c2f74d60daabd7bd1217ed73ac
font_01_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 10408 bytes
SHA-256: c61bbfceae8a496a28045225a93c34ce34372df4eee71996d3cf5fc1ee624f89

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