Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1a5b5dafd8235a…

MALICIOUS

PDF

83.3 KB Created: 2021-04-26 04:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 299acb66f20f6bda6d99f1b26aa97676 SHA-1: e3b1cbe5b1c58935358eadb9f7ca0a0fbf3fbdf4 SHA-256: 8b1a5b5dafd8235aff70e22651582bf9c10ecaccaa078073a9f4e407545471c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=where+did+common+core+math+originate PDF link annotation
    • http://odemebayisitrafik.com/fikemutetarezasadedapikue9lew.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/dudelovatexefuxavu.pdfIn PDF document text
    • http://stalekost.site/diwokusaxop1dpjq.pdfIn PDF document text
    • https://teputire.weebly.com/uploads/1/3/0/8/130813428/7052356.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/jdjetjg/rocket_city_trash_pandas_toyota_field.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_605670eb070a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_6023c8171097a.pdfIn PDF document text
    • http://barberking.best/how_to_get_rid_of_pimples_and_marks_naturally_at_home_in_a_weeko5gxe.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/2711993.pdfIn PDF document text
    • http://vehicleinsusa.com/kushies_fitted_flannel_crib_sheet_canadazmc5z.pdfIn PDF document text
    • http://gnatural.space/symptom_management_mental_illness_worksheets8a424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5fd12bb95fd61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365606/normal_5ff9ce143b022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5feb3a637077d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_60485fffe56d3.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/yicgfhb/dewububimuminumote.pdfIn PDF document text
    • https://tefitosuwit.weebly.com/uploads/1/3/4/4/134478986/mebug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_60186425bc239.pdfIn PDF document text
    • http://artrosil.xyz/raviridilaejaax.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
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 4944 bytes
SHA-256: 14ad99e84df3c7cf059b52ea631c6c6c6ba70ee5f661b536285cf021534b694a
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 11180 bytes
SHA-256: 38347cd370174153f78d3fe670ff16ae92d4d7f9629021ac0a431efb2380d635
font_02_sfnt_off0001302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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