Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cbb6e5d2aba53f…

MALICIOUS

PDF

82.3 KB Created: 2021-03-26 11:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2f089a6a051db536a3e20e8df060af30 SHA-1: 558552da5b78e0823cb9ff6384659e7a714451da SHA-256: 88cbb6e5d2aba53f426fc7f139117e287aa54ed340d59d9d240d29687623a91a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=azhage+azhage+album+song++kuttywap PDF link annotation
    • https://cdn.sqhk.co/kupejabel/Qjct324/goxonitowolad.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/xulivupemibu.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/2007_chevy_silverado_1500_for_sale_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/hejbih7/abalone_shell_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/hIhg3ic/screen_recorder_windows_with_audio_free.pdfIn PDF document text
    • http://degimogug.mypressonline.com/ap_calculus_ab_limits_and_continuity.pdfIn PDF document text
    • http://buluzapigal.22web.org/canadian_citizenship_form_cit_0002_e.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/2Aje79j/jetedenuxife.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/how_to_start_a_cake_baking_business_from_home_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/Egfghgh/17065118251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuzo/25078923049.pdfIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_2bf1e8889f1f44acbf6f5b97851610fd.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_5c332cd50fa44c46a58c988456393f19.pdf?index=trueIn PDF document text
    • http://sokurunofizune.rf.gd/a_k_sahani_instrumentation_ebook.pdfIn PDF document text
    • http://wowinagapujepok.epizy.com/sedas.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/kukapabetuzugadoxazofome.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/address_label_maker_template.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_75a9105e81fd4847bb219e978121b6d4.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 5576 bytes
SHA-256: 3c2e7db2ba8f0d7435736170ed4e97a2f94aee3ab3e2c93c8c7097061ad613cd
font_01_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 11568 bytes
SHA-256: f6898578ab2a0c22f786ed133966f4c68fe7264bb9a3fd3f686222d64233a8ee

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