Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70858bce1011d8b…

MALICIOUS

PDF

86.1 KB Created: 2021-01-16 15:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e22408fdfe50b14d7fdaf59f5015f8bf SHA-1: 5e9138b2fdc1c86bdaf6ceca857314a425210b95 SHA-256: b70858bce1011d8b7a5592c3f9162bb546cef0da914bfd1f648e792bf8b8c3d1
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains multiple embedded URLs, one of which is presented as a download link for a game mod apk. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is part of a link farm hosted on disposable domains, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafficel.ru/123?utm_term=panda+pop+bubble+shooter+saga+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fab5acba6459.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/7c86c936a8.pdfIn PDF document text
    • https://liduwofixuxobef.weebly.com/uploads/1/3/0/7/130739348/direbenuvizefu.pdfIn PDF document text
    • https://site-1171827.mozfiles.com/files/1171827/download_aplikasi_zoom_cloud_meeting_for_pc_free.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/74051573662.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/loroli-benavodeni-xowetaruweme-niwilipawolis.pdfIn PDF document text
    • https://site-1171826.mozfiles.com/files/1171826/tech_geek_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/PcheZ8g/rifetipoperududewi.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/Jhhhgjr/91522945328.pdfIn PDF document text
    • https://namukizup.weebly.com/uploads/1/3/4/7/134748015/49aa1faaf9636a.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/7A77Bid/liverpool_fc_iphone_6_wallpaper_hd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 5576 bytes
SHA-256: 68c3a6d68eedf9aba8f5aa4bbaf5ef3daef923bddff315f8fc34851430a65e2d
font_01_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 2552 bytes
SHA-256: ed3d0be3ea76de7739a917042cdb55ed0b051d9de1aa044f9fd336f1ed0a3692
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 11608 bytes
SHA-256: 8b2254785bc4391fe8ab0f6c6945e865cafbcb987bd008d32dd484a78c627bd4
font_03_sfnt_off00012e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_04_sfnt_off000142c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C6 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df

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