Malicious PDF — malware analysis report

Static analysis result for SHA-256 5796b5c723695d17…

MALICIOUS

PDF

77.3 KB Created: 2021-05-30 01:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bc2b7a06fb0a041de7c633043d131f5 SHA-1: ae9c70e7205b9140e68b0bd45fa9d79a917403d5 SHA-256: 5796b5c723695d17e0c26c8d0b5ef9ebeec815a3c5a4c067afd26b05b85fc34d
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 PDF files hosted on Weebly and other platforms, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are used to redirect the user to external sites, which could host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+do+you+connect+two+ue+boom+speakers+together
    • https://cdn-cms.f-static.net/uploads/4483336/normal_6050d351838fd.pdf
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/pekasagikilupavo.pdf
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/dedefirevagenuloxibu.pdf
    • https://cdn-cms.f-static.net/uploads/4409096/normal_601b0eecac5f5.pdf
    • https://pamimimafe.weebly.com/uploads/1/3/0/7/130775080/2660624.pdf
    • https://lefakapuwowe.weebly.com/uploads/1/3/4/3/134353253/bawexaxenibexi_jiguz_fobuduridunatiw.pdf
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/7b96b3e7f8a6d9.pdf
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/xuzukaribavate.pdf
    • https://cdn-cms.f-static.net/uploads/4419218/normal_6064e3c20f930.pdf
    • https://lufufalab.weebly.com/uploads/1/3/4/6/134634403/kibezok.pdf
    • https://valiveve.weebly.com/uploads/1/3/4/7/134730204/57d7e75017b34.pdf
    • https://selikiwomutarew.weebly.com/uploads/1/3/5/3/135329437/lopogarezuwam.pdf
    • https://cdn-cms.f-static.net/uploads/4427097/normal_6016cbc6e7f97.pdf
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/7900560.pdf
    • https://cdn-cms.f-static.net/uploads/4489975/normal_603c3d7c45903.pdf
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/magedawolagopa_bimepalepebunut_vonatexige_pozevinud.pdf
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/fe4dec.pdf
    • https://zusikemibuv.weebly.com/uploads/1/3/1/6/131606719/46542e.pdf
    • https://womonejod.weebly.com/uploads/1/3/2/6/132681039/vivunasamowaj.pdf
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/jenisel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ef78.bin
096c082b49e8a69a3b99ac2bab844b3fee0d9ea147f600477c7b7f35e17d26ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 5812 bytes
font_01_sfnt_off0001032a.bin
0bae14c27791e48ab4baac129f6ce2f32722459a7a5e4ee3051e2f6ac631fa67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10736 bytes

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