Malicious PDF — malware analysis report

Static analysis result for SHA-256 9456476434c51926…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 11:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9b232f25392bd746bfc37a4e0a4516 SHA-1: 30900b6b42b96fe4f76e78b130aaa5c7f5719962 SHA-256: 9456476434c51926ac180d9ec6a67fdca264705909787d281412d6ec8e8cfa44
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 to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=advertisement+12%252F+2019+hssc+pdf
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/9389208.pdf
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/vimepenaxe_raxiponogem_sufowasunubudul_vijafi.pdf
    • https://tejalegevususo.weebly.com/uploads/1/3/1/6/131637178/rulafewixaxum-xizigiribawak-bemajutefi-nodusaxaxedo.pdf
    • https://cdn-cms.f-static.net/uploads/4489848/normal_603a61a4c998d.pdf
    • https://static.s123-cdn-static.com/uploads/4385635/normal_5ff49f1a6a9c9.pdf
    • https://cdn-cms.f-static.net/uploads/4484356/normal_5fea03ad7c381.pdf
    • https://cdn-cms.f-static.net/uploads/4374957/normal_603419b5688a8.pdf
    • https://busegozujukot.weebly.com/uploads/1/3/0/8/130874370/kuzebevabosoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4383704/normal_605485c151343.pdf
    • http://italystore.pro/tijisfmbd6.pdf
    • http://useporte.xyz/laziloxujemutebudakivoxuc95bn.pdf
    • http://white-x.fun/darth_revan_cosplay_template91buo.pdf
    • http://groby-ritual.online/denovy8zq7.pdf
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/9910096.pdf
    • https://cdn-cms.f-static.net/uploads/4456663/normal_605a779c46b35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/46cfa55a-e327-4dd4-8f7f-494bf23ba545/how_much_does_information_technology_earn_per_month.pdf
    • https://uploads.strikinglycdn.com/files/f00804bf-8fec-4589-9320-a62c74820507/22458658524.pdf
    • https://uploads.strikinglycdn.com/files/ce74f259-0ede-4922-b7e6-6498f9abf087/sunulanotofas.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2d.bin
c6da9e0bc0fea887ffa3600da8351a16a7dcf61804455be1f538159fa18d0d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 5396 bytes
font_01_sfnt_off0000fd6a.bin
57d770272834c152d145d99eedccd5b434c94d9ef58c96a19b7e3e3a62a157ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 10624 bytes
font_02_sfnt_off0001219c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 4324 bytes
font_03_sfnt_off00012f9c.bin
46da7ffbe3116139a4705440625128d4dca827b562e64d6fe7481fbe66db9a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 3236 bytes

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