Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e69aa6dea0780e…

MALICIOUS

PDF

74.8 KB Created: 2020-12-30 01:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 258a6531b91bae3c479c852a378a130b SHA-1: 1774a127fe81c41bb44a9b1485299a5e74038724 SHA-256: c0e69aa6dea0780e01832c981c8f075a655c09fb7a4c2f23adc15c0f50d4447e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to redirect users to potentially harmful websites for phishing or malware distribution. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=text+to+letter+emoji PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f96f0309c23b.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/S7gJnKB/extreme_landings_pro_apk_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5f8fe13ad47ac.pdfIn PDF document text
    • https://cdn.sqhk.co/zukivutos/hjdjd1a/zorimu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fc504058728f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_5fc1310adc980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_5fdc08b8dff90.pdfIn PDF document text
    • https://kikosubulu.weebly.com/uploads/1/3/4/8/134884397/2163657.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/ejaegds/mobile_observatory_free_astronomy.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/hQhbiqU/twitter_video_downloader_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/ajeibhf/xajopemelipet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5fc7e3c78d7ba.pdfIn PDF document text
    • https://cdn.sqhk.co/sigagegijej/jmNijja/merge_cats_earn_crypto.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/3910d425-6671-4a52-97ab-2b64c3042226/56976044092.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 3656 bytes
SHA-256: 8f643b01bd00e341926e550685c27ab5fb109f76684c19daa34ddc59afb08cdc
font_01_sfnt_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 4536 bytes
SHA-256: 18b372948dafb131180b625356bed410100e7fdfebcc29b45850e6c291a01013
font_02_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_03_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 10580 bytes
SHA-256: 744f3c3e8c895e8e56e5b3ff003ea98b58d04ff4ae4c3a1afe0bd2fedb22ebcb

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