Malicious PDF — malware analysis report

Static analysis result for SHA-256 529e065e2de6c209…

MALICIOUS

PDF

96.6 KB Created: 2021-04-24 22:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 18db0ea8218a6f8865273909373a8148 SHA-1: d16132f9a0a54ad6913a8e905b015881038f39d4 SHA-256: 529e065e2de6c209d80419191bb99c016cf783c3ca28e3849d346393f8cfcf5f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document body, though heavily obfuscated, point towards a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://seumenha.ru/strik?utm_term=prentice+hall+gold+algebra+1+3-7+answers PDF link annotation
    • http://proita.fun/2515257716348jul.pdfIn PDF document text
    • http://creditinquiry.info/what_do_stained_teeth_meanzct2u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_60526e28385cb.pdfIn PDF document text
    • http://sokfresh.fun/power_cooker_plus_canning_instructionsk1rdp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422144/normal_5fc74db5d55b7.pdfIn PDF document text
    • http://domavera.ru/zaxokewujixuwawixeginvs9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_6013a6765fcea.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/4551876.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/xedigo_voxulawut_vipenoxigada.pdfIn PDF document text
    • http://mebets.xyz/torebosufag1yexg.pdfIn PDF document text
    • http://stebsmeh.space/android_watch_phonedmlf4.pdfIn PDF document text
    • http://wekeb.space/how_to_access_wd_my_cloud_storagek2imc.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/faverimuzevezimub.pdfIn PDF document text
    • https://genebametujo.weebly.com/uploads/1/3/4/9/134904617/ad6fb77ec.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/e6add31df2d1.pdfIn PDF document text
    • http://fruitslope.online/kesimigalipesabqkfkr.pdfIn PDF document text
    • http://idealica-ordina.site/wordscapes_in_bloom_daily_puzzle_october_7_2020x3bb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_6006f95424fbe.pdfIn PDF document text
    • http://polnews.xyz/28550856128lm0p6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_008d22e0dad44010bea593de23c96286.pdf?index=trueIn PDF document text
    • https://3df016ad-b40f-424f-9918-b96c60f46212.filesusr.com/ugd/387bfe_c3a61d2bb273462ba90085aabbf15908.pdf?index=trueIn PDF document text
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_1a6eb2ca93374edeb91580a4e69d1c4f.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 5552 bytes
SHA-256: f13c5d40dbccdcd25b3ffbf58bdefced18dea9e96d482524438fb81bc2200b64
font_01_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 11628 bytes
SHA-256: 0e690b747ce37eb3201409ccf53dd9cdbeed6f38972e6ca7afd912463a4c5167
font_02_sfnt_off0001512e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512E 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e
font_03_sfnt_off000165f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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