Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10a0c9a96c5d1ae…

MALICIOUS

PDF

75.2 KB Created: 2021-06-08 06:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 943287f815f5a51740570629b04961b6 SHA-1: 6ba7071d321f4d8d8aa2806bb20b46d86f1a11a7 SHA-256: a10a0c9a96c5d1aea226b6989312e11ab592caee5cfdbd9bb0c60edf5f0f9d0c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and the ClamAV detection. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL and the document body, though heavily obfuscated, suggest a lure related to educational materials, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/wb?keyword=wow%20english%20book%20class%205%20solutions%20pdf
    • https://cdn-cms.f-static.net/uploads/4456687/normal_6057bc52a81e9.pdf
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/telet-penulufalixawaf-fobakuwurazabev-befipo.pdf
    • https://cdn-cms.f-static.net/uploads/4418001/normal_605a645a33c75.pdf
    • https://static.s123-cdn-static.com/uploads/4368467/normal_5ff5a2ed6e745.pdf
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/desesujorur_zepesokawo_kumefimesupa.pdf
    • https://cdn-cms.f-static.net/uploads/4476281/normal_601e15af7117b.pdf
    • https://static.s123-cdn-static.com/uploads/4414175/normal_5ff8d6e93960b.pdf
    • https://jonubafepap.weebly.com/uploads/1/3/4/7/134737483/1694455.pdf
    • https://static.s123-cdn-static-d.com/uploads/4443598/normal_60b59cd7206b1.pdf
    • https://sidagavaru.weebly.com/uploads/1/3/2/8/132814791/365477.pdf
    • https://cdn-cms.f-static.net/uploads/4452395/normal_601c5c7e82028.pdf
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/042b60f7b248f3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/22196f4b-85a4-4a21-9efb-51d0ef44d9e9/polygons_and_quadrilaterals_worksheet_answer_key.pdf
    • http://dusozivelas.pbworks.com/w/file/fetch/144784917/how_to_read_taylor_food_scale.pdf
    • https://uploads.strikinglycdn.com/files/36d32afc-3195-4106-aa9a-769387986e1f/59266952528.pdf
    • https://uploads.strikinglycdn.com/files/6153c59d-0066-4b2a-a10f-e4dc096bdf79/pearson_algebra_1_textbook_table_of_contents.pdf
    • https://uploads.strikinglycdn.com/files/96bd5235-f464-46ba-a557-3312469ed2e1/90747408929.pdf
    • http://tiduxikuve.pbworks.com/f/kurosi.pdf
    • http://gamaxidad.pbworks.com/f/lasafej.pdf
    • https://uploads.strikinglycdn.com/files/7c8bcddf-8114-4bd4-84b6-a097b97f7c34/21864105786.pdf
    • https://uploads.strikinglycdn.com/files/2f99fe84-5df9-475c-a8c8-7444aebad0e4/18908111681.pdf
    • https://uploads.strikinglycdn.com/files/a1fa4d55-6919-42eb-86ce-5b2142f302f9/joxawatisupag.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_off0000e505.bin
2b129d787fdf136bc27bbfe2ee6c0fb14ae17322d5fe339c9364a6338058b940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 5752 bytes
font_01_sfnt_off0000f8c4.bin
3aa1f8e35a50b22d31eda02cf382f4e39812313b4144655db187d5a6a44c5926		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10648 bytes

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