Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca00ae7f4082b138…

MALICIOUS

PDF

71.3 KB Created: 2021-02-22 12:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 92a8f8341b63972a5e2bac046e464ffa SHA-1: dfe5c22bfb3f859ac353b253d79ed311789a0f2c SHA-256: ca00ae7f4082b138c811d852f49032415b7d1fa0fb491a6e58ad1e2b2e028631
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a PDF link farm. The embedded URLs, such as 'https://yafferge.ru/123?utm_term=new+hunger+games+book+softcover', likely lead to phishing sites or malware downloads. The presence of numerous external PDF links suggests an attempt to create a link farm for SEO manipulation or to distribute further malicious content.

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
  • 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/123?utm_term=new+hunger+games+book+softcover In PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_60017f759de48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_600fad47224b0.pdfIn PDF document text
    • https://nujelojebalu.weebly.com/uploads/1/3/4/6/134690198/poxujaneziganomove.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/d0ghhby/horizon_forbidden_west_pre_order_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473064/normal_5feee4a9bce1d.pdfIn PDF document text
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/goripagegol.pdfIn PDF document text
    • https://winulovovitazu.weebly.com/uploads/1/3/0/7/130740324/tobozevovatotu.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/icgfhci/kepogitalawuvugisunudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fcb4df524a0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379234/normal_6000f7d58f921.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/xojobodupif-sewogosudaret-nubobamuwod-ronewibi.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/0gcTPhb/smart_recorder_high_quality_voice_recorder_pro_apk.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/fokapikow/savomunemelutewigife.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/cd_label_ms_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/69686958777.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_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 5588 bytes
SHA-256: fe63481c7e5cf0ddb8f425f49f8937f2aa75e6561f991f0c21ae026e49520647
font_01_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 10460 bytes
SHA-256: f824f7d747b21673815b4d531ffa949b1b01a0e95643374558b35b204cede29c

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