Malicious PDF — malware analysis report

Static analysis result for SHA-256 979b0c4f0841fbc1…

MALICIOUS

PDF

103.7 KB Created: 2021-03-14 00:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6668f2fc4b5a7030ed75f0f721e5b303 SHA-1: 1180d7753dc6b3e9e33346fcd40a44a4e3a039d6 SHA-256: 979b0c4f0841fbc117db7e2bc6a3cde09b9f55f9a667e3c9f22cd690e0563344
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farms to manipulate search engine results or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a compromised or malicious domain for further exploitation.

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://maypoin.ru/award?keyword=zambia+biology+syllabus+pdf
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/7315829.pdf
    • https://botuniditiga.weebly.com/uploads/1/3/0/9/130969051/fegofegorakel-berisa-lofafebipesukuw-karufekobaru.pdf
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/nudilarezexez_lipiwin.pdf
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/folibujazuzavik-texiza-fupumisupafabil.pdf
    • https://cdn-cms.f-static.net/uploads/4459054/normal_602eeba38c1f4.pdf
    • https://cdn-cms.f-static.net/uploads/4481065/normal_6039b02e0941f.pdf
    • https://cdn-cms.f-static.net/uploads/4375889/normal_603d196791338.pdf
    • https://sumeropesoxiv.weebly.com/uploads/1/3/5/3/135316328/keferinog_mikokodazufe_deragen.pdf
    • https://cdn-cms.f-static.net/uploads/4383573/normal_60159f368057c.pdf
    • https://cdn-cms.f-static.net/uploads/4417653/normal_603e3f18a9eab.pdf
    • https://ganizosu.weebly.com/uploads/1/3/4/4/134434359/godonelade.pdf
    • https://mudujisobugabe.weebly.com/uploads/1/3/4/5/134511382/1105661.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/daraniwekamidir/cuantos_son_los_libros_de_la_biblia_reina_valera.pdf
    • https://s3.amazonaws.com/taguxif/south_africa_economy_2019.pdf
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_4a908316325f427a9980abfe99883068.pdf?index=true
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_277d3722a1714218802c7a7d2402f081.pdf?index=true
    • https://s3.amazonaws.com/legapatatezisa/bb_t_mobile_app.pdf
    • https://s3.amazonaws.com/xonobijikivo/64282628073.pdf
    • https://s3.amazonaws.com/gelawiweza/dowezilinotemage.pdf
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_677e1ae559c24152bf8a0ae3529bbfcd.pdf?index=true
    • 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_off00015b22.bin
542b8078ba40bd9e96ed302e7b71949c5f84c5b8d4a7c20c7b186e910d8ecbc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B22 5464 bytes
font_01_sfnt_off00016db2.bin
0f2e901277e78c419f6e05b286dfd0b56cc32e4cdedd777102ed1a504b57784d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB2 10428 bytes

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