Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7dd464d74c6656…

MALICIOUS

PDF

77.0 KB Created: 2021-01-11 18:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aedf3820403a559bb37690aed2332d00 SHA-1: 33ec1982a866c23c4b7e2cea1e2adcb40db62b7e SHA-256: aa7dd464d74c665649537c496a11da236161a5525a93d62c877e33898c777d62
214 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a link to known malicious redirector infrastructure and a large PDF link farm, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards an attempt to lure users to external, potentially harmful, 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://ggtraff.ru/123?utm_term=knights+and+samurai+similarities In PDF document text
    • https://cdn.sqhk.co/vagewovupug/jgmidie/calcular_iva_chile.pdfIn PDF document text
    • https://lufodeku.weebly.com/uploads/1/3/4/5/134586195/9951637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5f8f5b7edb346.pdfIn PDF document text
    • https://cdn.sqhk.co/bijininabex/hbxMm3u/virtua_tennis_challenge_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/GPjdgiF/minecraft_dungeons_crossplay_release_date.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/nedalavow_basugir.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/af5ebc7d9375.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/oheNJ3W/48619006684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5fd2ecb86c87e.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/Ridhdij/37596016157.pdfIn PDF document text
    • https://mesovozilepako.weebly.com/uploads/1/3/4/5/134588792/zuvobutu-tumovodinipaj-tudada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5fa3896b72ea0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zatazewoz/11112249872.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 4980 bytes
SHA-256: 7da97be14023569f3efe77cc97f1eff754dd59f48835eed29f9ed0f641bab90d
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10520 bytes
SHA-256: b266347526521950d706ee4e3d2e574e436a5e5bb9aa293b85692b904b3e7a86
font_02_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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