Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d4cc9ca50600a4…

MALICIOUS

PDF

81.8 KB Created: 2021-06-01 05:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 754e20fc194861686c29cdfe087c3575 SHA-1: 292b4fdf7c0b7ee171f0bf80d48fb18296c25b62 SHA-256: c8d4cc9ca50600a49ebc08b0f767d434c693f7c3af8bb3e27b62548d250190ff
194 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many pointing to disposable hosting services, suggesting a phishing or malware distribution scheme. The presence of a 'Download' button lure further supports this. Although no scripts were explicitly extracted, the PDF structure and the ClamAV detection as 'Pdf.Phishing.Trojan' indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/pbw?utm_term=download+game+ppsspp+naruto+impact+iso+highly+compressed PDF link annotation
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/zeletufun_duboxixep_fezar_xixepaxazonuzax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_6023a10d9841f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5ffe88cee3294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_602b34f024147.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fececc0354f1.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/5285817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_5fdb554b92779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_60530a984f67e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_605d6e089f34f.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/gejasenonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_606dcb4c7f5f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_5fe983fc173a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_604de162cf740.pdfIn PDF document text
    • https://legawugo.weebly.com/uploads/1/3/4/5/134509979/2721207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_604ad1a38b277.pdfIn PDF document text
    • https://bovuvodesibos.weebly.com/uploads/1/3/4/3/134377535/wawipowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425382/recep_ivedik_4__35_dakika_full_izle.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/68159437058.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144424092/gavonurejep.pdfIn PDF document text
    • http://botinuba.pbworks.com/f/gogikadamiporiwu.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/38431588940.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144424026/dont_escape_4_days_in_a_wasteland_unblocked.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 4420 bytes
SHA-256: 2b06556739a186bd2d59c0a921c472bde9bbea941087252aa4e6b05aa520abfd
font_01_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 5680 bytes
SHA-256: ffafc61b95e5acc671bfd16652fd2a8cdea8035c30e930515386b098cdffbf08
font_02_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 11316 bytes
SHA-256: 58c58082cdadf2b60bc4fc3990d764b738105f4cc8bb0c65aac5b6e89e7108a0