Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e23a243a145ee1…

MALICIOUS

PDF

79.2 KB Created: 2021-05-12 00:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 34afac594b8d6eaf97d5911277d60f04 SHA-1: 12cc4896af4cca2b45b71aac34dfb6490e61fddf SHA-256: 88e23a243a145ee10745f6d9d56273dc487bfb4e6d3f5a80da31820822a8923e
126 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The primary URL, 'https://druttle.ru/strik?utm_term=sandisk+clip+jam+mp3+player+not+recognized+by+computer', is designed to lure users with a technical problem. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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/strik?utm_term=sandisk+clip+jam+mp3+player+not+recognized+by+computer PDF link annotation
    • https://cdn.sqhk.co/tororukiwuri/jW2jhFZ/75309573762.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/gjjePob/tmnt_portal_power_download.pdfIn PDF document text
    • http://baturoguvumoviz.22web.org/surface_area_of_composite_figures_worksheet_answers.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/dikomavomem/arraylist_hashmap_string_string_android_listview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb095acb-56d7-4680-bc25-d06f64642a0d/55250222724.pdfIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_7b614ea42fad4424951591a611cbb2e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/53567809320.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_5b8af536e3804c93bdb0276616233dda.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_a1e1631aa93d4c529443f1bc09c6ccc1.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_47d11fdc489a4da795321fc8fcc98ac7.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_e251b7ce55884dd0858cac4c64ecc1e9.pdf?index=trueIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_4a1ddbcc25e349f9a846c5b3f656c862.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_25f903c97a2346819c5978212060e3be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/pedufozofefunej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a04304-40a5-4212-b74d-b9e72640b331/zuwitizofu.pdfIn PDF document text
    • http://gojetovumivet.epizy.com/long_sleeve_shirt_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a07b56-228b-4b3a-a2f5-f0a77e05aed4/tabla_periodica_de_los_elementos_qumicos_para_imprimir.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/85023780056.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_b5295119d48a4724888d603761efa035.pdf?index=trueIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_3ccdd3542380441b8e2b24040b0294cf.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_095f75bdb0ab4232bb608fe3a499f4fe.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_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 6092 bytes
SHA-256: df4ee4d03fc8a4e46dcdc4198c5686a747936d919db588ab6523667fe98be2c0
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 11176 bytes
SHA-256: 13bf7b3dc16d85eb964d1670807ca42b0f5840a45fb8e191acb837e39d081da9