Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5773a18da2b312…

MALICIOUS

PDF

91.0 KB Created: 2021-04-23 15:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 863838191d7dd0ad74b0836b517562a0 SHA-1: 47a7829932cf6704576a50057ab356b84271af62 SHA-256: 1e5773a18da2b312a26e8c743d737c4a69f179b9ea498566185b69b32f690969
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=printable+eagle+scout+oath PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5ffb6dbb0cc58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368962/normal_5ff6bd480fdae.pdfIn PDF document text
    • https://bajiwemijowulu.weebly.com/uploads/1/3/5/9/135990815/b17757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_6013d83fdf729.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/bewapofava.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5fe5696f60c71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_6002dd4dccbd8.pdfIn PDF document text
    • https://mutapeninudit.weebly.com/uploads/1/3/2/7/132712174/f884ac56f62.pdfIn PDF document text
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/moturiga_vevinoj.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/adirondack_chairs_plans_free.pdfIn PDF document text
    • https://xonajababivoxo.weebly.com/uploads/1/3/4/0/134040492/55933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_7f67dd3a6a394b229acb87d6762ebdd4.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_fce70bace2b1428c95b2643a2f605453.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b660e6bf-d730-4a52-9575-c7be01933b51/world_history_textbook_answers_mcgraw_hill.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_d85b85053d754c28b15d0c36b581acaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20e2dd3-9d22-4b3f-81bd-7ba5d7b06133/48236461502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0935d291-6702-4dbd-a545-e00138be0cd7/76256342316.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_f8d1ecc873494a00bdde45e8acfed2ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb373ef0-2a9c-49fd-a158-1537f9aa9d96/74513677683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c16bd1-b166-4b82-8cb4-ae9413feeb75/17581888439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b62a32-18f8-4f66-bcbf-f7482d2a43c4/kitchenaid_3.5_cup_food_chopper_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baacfd03-b971-4d4c-b985-8690504a8324/84172568461.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 5204 bytes
SHA-256: 34e28dd62a54a24945d0abd3f4ffac796027611b9dff7bdbf9dd317c40374d16
font_01_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 10956 bytes
SHA-256: 7f05e57338ff9a5335d8aa9b5d349750e56fda6c07751553e8e93debc0fc693e
font_02_sfnt_off0001455e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455E 17264 bytes
SHA-256: 3667f0e9fb069bf749ee135f5cde457f513979f7dc4643c17cfb6e606c2697fe

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