Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc8770bfc345197…

MALICIOUS

PDF

79.4 KB Created: 2021-03-11 01:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b43b1f216f690b236691d2dc14c1e5f SHA-1: 1ebb7839ef5e1da16332f537a9f693232f4a4c50 SHA-256: 5bc8770bfc3451971e92f5737b5541fda77351451bfce8d5b09f22322bf3417d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=bioenergetics+pdf+lowen
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/a07515645848eb.pdf
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/litagomasilalav.pdf
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/ac4a2bee6.pdf
    • https://lusabosebab.weebly.com/uploads/1/3/5/9/135972845/9721075.pdf
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fcbd4103323c.pdf
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/vufefuf_zebonadojedubaf.pdf
    • https://static.s123-cdn-static.com/uploads/4446286/normal_5fcd3150e2200.pdf
    • https://rixafivi.weebly.com/uploads/1/3/1/3/131380000/rovufaxupatesewoxim.pdf
    • https://dinasozuze.weebly.com/uploads/1/3/1/3/131383342/aea4323305fa50e.pdf
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/ralenefanu.pdf
    • https://cdn-cms.f-static.net/uploads/4453108/normal_601f2330ac940.pdf
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/narubisifoxanezos.pdf
    • https://static.s123-cdn-static.com/uploads/4459185/normal_6000407a70e25.pdf
    • https://tedotedonux.weebly.com/uploads/1/3/0/7/130775879/kilat-refov-jutitav.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/godowupatumekim.pdf
    • https://cdn-cms.f-static.net/uploads/4492574/normal_602d4da622d85.pdf
    • http://nuwiratuzitezep.22web.org/pewakijofoluxikupizuv.pdf
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/jurovodar.pdf
    • https://cdn-cms.f-static.net/uploads/4403820/normal_60401065782c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xujekapowizi.epizy.com/63628890931.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb89.bin
936d8aef9eacbb037ca7ac54f567c4282457c7af8c06fa65434ad0edd79d810a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 5252 bytes
font_01_sfnt_off00010d94.bin
579e5fef5f22eb08e53f2e4e59cc5a6d22a8692cc7a4f82ad8edc79c01380237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10240 bytes

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