Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be51fe3e28f7a20…

MALICIOUS

PDF

74.2 KB Created: 2021-02-16 09:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 35cbb4719ce1cc9b13420c5f36e53f6b SHA-1: 49d0811557921cfe84b78a047e1f32906adeccde SHA-256: 0be51fe3e28f7a206f80adfafc133f26a1402f1ac1f538c178cd064f1c957844
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites that are likely part of a link farm or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the heuristic firing 'PDF_MALICIOUS_REDIRECTOR_LINK' suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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://yafferge.ru/strik?utm_term=circle+worksheets+4th+grade In PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/nedesizadaxume.pdfIn PDF document text
    • https://tefuledajejus.weebly.com/uploads/1/3/1/4/131437322/rejewaxoz-rakak-jezibulav.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/mileda.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/5401094.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/dolaw-rinorax-dozopa.pdfIn PDF document text
    • https://sisezapude.weebly.com/uploads/1/3/1/3/131398367/kuburivijarovoxevug.pdfIn PDF document text
    • https://wifadesar.weebly.com/uploads/1/3/5/3/135345928/mixebejoteruku-dagusiredagizu-jaxubavojow.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/55475.pdfIn PDF document text
    • https://subopojulolilat.weebly.com/uploads/1/3/4/3/134319837/mixogufake.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/8f830ba5c78.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/kakef/lofogig.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/duponerorifune.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/panasonic_cordless_phone_answering_machine_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/hungry_dragon_apk_obb_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/forixomox.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/9298571753.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/fibefigojitinise.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/11475948950.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/rilifix.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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 5352 bytes
SHA-256: 93d4c043788f28bb5379468a58e1a746915b1fd3cfe1b4f45d3a069311f7b226
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 10708 bytes
SHA-256: e65a0704cf2b2051ca99d8367891e0f2f88ae5ee967c09149c6bcf91a31191bc

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