Malicious PDF — malware analysis report

Static analysis result for SHA-256 3101c2ead740fb1d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 02:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96dd9d81b0556e96fb4de3cf3eb9ec21 SHA-1: e1378ac664c6a360f418ef2fca70368b338659a0 SHA-256: 3101c2ead740fb1df67c76ed535dd800a38868abc7210b0518c63e7a0e365d55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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 http://jyjwqj.com/uploadfile/file///2021091822162413.pdf
    • http://el-system.jp/uploads/2012/files/vedupuj.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/71317795397.pdf
    • http://chornakorn-packing.com/ckfinder/userfiles/files/tafekixofonadijure.pdf
    • https://xn--49st2et51duvk.com/upload/files/pifediguninuvis.pdf
    • http://abwingsva.com/uploads/files/80223028063.pdf
    • http://fratellilongoni.com/userfiles/files/20345192203.pdf
    • http://dailycan.com/userfiles/files/54886289335.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/bitukameduzivozan.pdf
    • http://shijijiaming.cn/filespath/files/20210910095736.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394af41bc92---35685431085.pdf
    • http://www.saletime.gr/admin/fckfiles/file/50750461601.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0ea1a342---95936718624.pdf
    • https://mimpiindah1.com/contents/files/51809292589.pdf
    • http://hankyunget.net/userData/board/file/54413085957.pdf
    • http://boden.boj.se/uploads/userfiles/files/76317029916.pdf
    • https://behagi.eus/files/galeria/files/vuwixor.pdf
    • https://brincandoeaprendendo.com/fotosempresa/files/99771834970.pdf
    • http://vita24h.com/uploads/userfiles/file/modobiponid.pdf
    • https://vsetinrally.cz/userfiles/file/sokutisovabirom.pdf
    • http://lifeline-sports.com/files/file/42606274904.pdf
    • https://windfreeklima.com/upload/ckfinder/files/xadawenaliburamipuw.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631783209.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/zesikiw.pdf
    • http://henca.com/files/details/file/9549642169.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bmw+launcher+apk
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96e.bin
5e443fc830500a3d99301ccaf42cefc4c7edc49973b56c4cb4bbe73fb745a303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 21392 bytes
font_01_sfnt_off000111bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 16792 bytes
font_02_sfnt_off000129d2.bin
1c238dfcee0d9232e4f630e053ec5287bad3d96ae3d2c534d6bfb19d823a374b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 10492 bytes

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