Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cfb103a2d9b73f…

MALICIOUS

PDF

80.4 KB Created: 2021-04-19 20:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d93b0c917b62322138e665ac976f53a SHA-1: 2b0fd38bfdf4586b0cb7a5dad6ca4ae7c3c27779 SHA-256: 38cfb103a2d9b73f16e8ea6690c4e8e177fc0ac956bb469e8d5ac377dad2eb6e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://mezovuduw.ru/strik?utm_term=lopi+wood+stove+insert+cost PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500883/normal_6001a4b846ad1.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/hieie50/crackshooter_flyff_quest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_60247171d4850.pdfIn PDF document text
    • https://revotilam.weebly.com/uploads/1/3/4/7/134732497/zabipafave.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/black_and_decker_cordless_drill_combo_kit_with_case.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/cggl2Nu/monster_maze_runner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_6016d5e995b76.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/sefolumapimeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_605dcd3e57b97.pdfIn PDF document text
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/44e7e99ef39b.pdfIn PDF document text
    • http://kepukarob.sportsontheweb.net/small_reader_app.pdfIn PDF document text
    • http://megaparegeduze.iblogger.org/atom_c_ide.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/JjcdDBn/assembly_line_invention.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/zqpihMF/ahly_vs_zamalek_live_match.pdfIn PDF document text
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/1245179.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/suwup.pdfIn PDF document text
    • https://suranekiwexem.weebly.com/uploads/1/3/4/6/134698667/b61373aa.pdfIn PDF document text
    • https://gomadiwisedewun.weebly.com/uploads/1/3/5/3/135314557/90128.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://kuvevepakamobo.epizy.com/ludijonigigetotugorepuk.pdfIn PDF document text
    • http://xiwularofevomu.epizy.com/halving_odd_numbers_ks2_worksheet.pdfIn 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_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 4704 bytes
SHA-256: 5ee49b4462f31ec13c7b8b57ae5be4c207751a7061a377db1ac9faed54ee9869
font_01_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 10640 bytes
SHA-256: c6fe253eacbaabdee8c6036acc0d5e4634037795b1e63e26ec534dec10d89599
font_02_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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