Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d13e06b2c4baf9…

MALICIOUS

PDF

80.0 KB Created: 2021-03-29 13:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a218c9a10948651ea28baa2a62dbe08 SHA-1: 73d80a05c069592bbe3d3ad593f76320d81a59da SHA-256: 24d13e06b2c4baf9d3d8125d914a577746d560a79349bef450eef77c879af20f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a site that appears to be a link farm designed to attract search engine traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/award?keyword=types+buffer+systems+in+the+human+body+pdf
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/153275.pdf
    • http://mowefopovog.mywebcommunity.org/bams_colleges_in_maharashtra_with_fees.pdf
    • http://suraneb.scienceontheweb.net/faxadevuputabinadibidal.pdf
    • https://tilolujow.weebly.com/uploads/1/3/1/1/131164317/ninetafesulo-labiwuze-zosuk-nazoto.pdf
    • https://siximegam.weebly.com/uploads/1/3/1/4/131453251/3171369.pdf
    • https://legopaxazomunan.weebly.com/uploads/1/3/5/3/135396831/kozemasofufel_sirexurogi_fozajonilaniboj.pdf
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/fanipojin.pdf
    • https://nufusuninad.weebly.com/uploads/1/3/4/6/134609023/jobaw.pdf
    • https://jogemubo.weebly.com/uploads/1/3/4/3/134321321/3670324.pdf
    • https://dogeneli.weebly.com/uploads/1/3/0/7/130776728/fcb203.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c2a711cc-ee40-4120-b669-101e37d6bdb2/7022061714.pdf
    • https://uploads.strikinglycdn.com/files/7bb61c63-e45a-467c-8856-1af6e5ce014b/57056460284.pdf
    • https://uploads.strikinglycdn.com/files/87cdcd1a-c201-4794-8ab3-f3d70d43d0e1/71999738813.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_5498a5f987f44f7f97cd1ede08fc8a96.pdf?index=true
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_68fe2ac8701d41d385fe99957801d5bc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45d7f758-ca68-43d6-8c25-2846964ea120/14766948579.pdf
    • http://zedowep.atwebpages.com/29181278237.pdf
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_46e3aef10f934b2b81515cbdd142c4ce.pdf?index=true
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_b69918be8aff456fa3346dcc48787dae.pdf?index=true
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_ddd40b56f2d046ba9ff572e10926b803.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92df580f-a4c0-435f-ab66-2665469bafae/pierce_college_english_101_syllabus.pdf
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_e9d6334ba3e7486cabd4bd85541b4698.pdf?index=true
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_77447fe334bb4bd29ad562d4319566eb.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_off0000fbdc.bin
a379b9c13f0f212cc92df01297ee5f3a2a6e5042a58f8530c355deba3073ac41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 5440 bytes
font_01_sfnt_off00010e30.bin
97335dfb0c7f07fbbff2b913b70b69e742e7b0d5305e3cf80d778917eaf024f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 10792 bytes

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