Malicious PDF — malware analysis report

Static analysis result for SHA-256 c130681f212f1dc8…

MALICIOUS

PDF

79.3 KB Created: 2021-05-12 06:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 959350e416fa16f3a18177cbee61b0b6 SHA-1: 0ae92a5139a16781ea53405155ac2cffc6fb5602 SHA-256: c130681f212f1dc843a550dbb10eeedc49bbaf45bf3534b54f48d7f563bcb9d2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely for phishing or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+university+are+known+for+nursing+in+melbourne In PDF document text
    • http://2gusevshop.space/how_to_insert_excel_formulas_into_wordy044n.pdfIn PDF document text
    • http://ionatr.fun/square_root_of_240_in_radical_form8afak.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/7551684.pdfIn PDF document text
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/tivanakewifo.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/xbijaia/sugob.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/Thcgeib/pokemon_ash_and_pikachu_wallpaper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/bjjgcjc/kaiser_permanente_employer_plans.pdfIn PDF document text
    • http://ooovseanalizi.ru/2nd_grade_2_step_math_word_problems_worksheetyoiz2.pdfIn PDF document text
    • https://cdn.sqhk.co/monazaxumol/UXS7M1X/penabize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/924bf63c-3dda-4962-8fdd-bd860dfec101/briggs_and_stratton_quantum_675_spark_plug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab45280-cdb1-434c-a1a4-a333243ff178/what_is_chick_fil_a_starting_pay_in_texas.pdfIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_3a611c1abf3449169d0b62fd4e5c140a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c85486-b116-42f0-885a-54033cbf0788/muluvuwavojofam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a12c199-0c50-478d-9d8b-ec719dfbe67e/diary_of_a_wimpy_kid_double_down_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7761db5e-1a0d-4215-ae41-68f314bb0a70/homelite_super_2_chainsaw_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1064e4f7-4931-461b-80de-21330293f6ef/what_is_a_chemical_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a407af92-0bef-4d7b-a35c-4349e8b9ba75/gegasul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f07674-b887-4a8f-a04a-e9cc8daa94dd/the_firm_nas_album.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_6fa9cdcdb405485abda6a588a66a3fec.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_2066a1848be44beda3f7e26b93ea105d.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_bb6c434e1ed64e5d91d3e2368e45a277.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 5652 bytes
SHA-256: 9b4258f07e52e37ec1d63a73be465387c8859b035e32f9185bee4e214836e21e
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 11108 bytes
SHA-256: ee9a8f239ebc8e4c4780204982dddd4c42462bc35fc58fe33fff486615c1f6f3

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